diff --git a/quiche/quic/moqt/moqt_error.h b/quiche/quic/moqt/moqt_error.h
index a9d6d86..085af18 100644
--- a/quiche/quic/moqt/moqt_error.h
+++ b/quiche/quic/moqt/moqt_error.h
@@ -71,6 +71,7 @@
   kMalformedTrack = 0x9,
   kMalformedAuthToken = 0x10,
   kExpiredAuthToken = 0x12,
+  kDuplicateSubscription = 0x19,
   kPrefixOverlap = 0x30,
 };
 
@@ -78,6 +79,7 @@
   RequestErrorCode error_code;
   std::optional<quic::QuicTimeDelta> retry_interval;
   std::string reason_phrase;
+  bool operator==(const MoqtRequestErrorInfo& other) const = default;
 };
 
 RequestErrorCode StatusToRequestErrorCode(absl::Status status);
diff --git a/quiche/quic/moqt/moqt_framer.cc b/quiche/quic/moqt/moqt_framer.cc
index 59aa538..8bb83a8 100644
--- a/quiche/quic/moqt/moqt_framer.cc
+++ b/quiche/quic/moqt/moqt_framer.cc
@@ -573,21 +573,16 @@
 
 quiche::QuicheBuffer MoqtFramer::SerializePublishNamespace(
     const MoqtPublishNamespace& message) {
-  KeyValuePairList parameters;
-  if (!FillAndValidateVersionSpecificParameters(
-          MoqtMessageType::kPublishNamespace, message.parameters, parameters)) {
-    return quiche::QuicheBuffer();
-  };
-  return SerializeControlMessage(MoqtMessageType::kPublishNamespace,
-                                 WireVarInt62(message.request_id),
-                                 WireTrackNamespace(message.track_namespace),
-                                 WireKeyValuePairList(parameters));
+  return SerializeControlMessage(
+      MoqtMessageType::kPublishNamespace, WireVarInt62(message.request_id),
+      WireTrackNamespace(message.track_namespace),
+      WireKeyValuePairList(message.parameters.ToKeyValuePairList()));
 }
 
 quiche::QuicheBuffer MoqtFramer::SerializePublishNamespaceDone(
     const MoqtPublishNamespaceDone& message) {
   return SerializeControlMessage(MoqtMessageType::kPublishNamespaceDone,
-                                 WireTrackNamespace(message.track_namespace));
+                                 WireVarInt62(message.request_id));
 }
 
 quiche::QuicheBuffer MoqtFramer::SerializeNamespace(
@@ -608,8 +603,7 @@
     const MoqtPublishNamespaceCancel& message) {
   return SerializeControlMessage(
       MoqtMessageType::kPublishNamespaceCancel,
-      WireTrackNamespace(message.track_namespace),
-      WireVarInt62(message.error_code),
+      WireVarInt62(message.request_id), WireVarInt62(message.error_code),
       WireStringWithVarInt62Length(message.error_reason));
 }
 
diff --git a/quiche/quic/moqt/moqt_integration_test.cc b/quiche/quic/moqt/moqt_integration_test.cc
index 5fc8956..1262b49 100644
--- a/quiche/quic/moqt/moqt_integration_test.cc
+++ b/quiche/quic/moqt/moqt_integration_test.cc
@@ -18,13 +18,13 @@
 #include "quiche/quic/core/quic_time.h"
 #include "quiche/quic/core/quic_types.h"
 #include "quiche/quic/moqt/moqt_error.h"
+#include "quiche/quic/moqt/moqt_fetch_task.h"
 #include "quiche/quic/moqt/moqt_key_value_pair.h"
 #include "quiche/quic/moqt/moqt_known_track_publisher.h"
 #include "quiche/quic/moqt/moqt_messages.h"
 #include "quiche/quic/moqt/moqt_names.h"
 #include "quiche/quic/moqt/moqt_object.h"
 #include "quiche/quic/moqt/moqt_outgoing_queue.h"
-#include "quiche/quic/moqt/moqt_priority.h"
 #include "quiche/quic/moqt/moqt_probe_manager.h"
 #include "quiche/quic/moqt/moqt_publisher.h"
 #include "quiche/quic/moqt/moqt_session.h"
@@ -172,86 +172,73 @@
 
 TEST_F(MoqtIntegrationTest, PublishNamespaceSuccessThenPublishNamespaceDone) {
   EstablishSession();
-  auto parameters = std::make_optional<VersionSpecificParameters>(
-      AuthTokenType::kOutOfBand, "foo");
+  MessageParameters parameters;
+  parameters.authorization_tokens.emplace_back(AuthTokenType::kOutOfBand,
+                                               "foo");
   EXPECT_CALL(server_callbacks_.incoming_publish_namespace_callback,
-              Call(TrackNamespace{"foo"}, parameters, _))
+              Call(TrackNamespace{"foo"}, std::make_optional(parameters), _))
       .WillOnce([](const TrackNamespace&,
-                   const std::optional<VersionSpecificParameters>&,
+                   const std::optional<MessageParameters>&,
                    MoqtResponseCallback callback) {
         std::move(callback)(std::nullopt);
       });
-  testing::MockFunction<void(TrackNamespace track_namespace,
-                             std::optional<MoqtRequestErrorInfo> error_message)>
-      publish_namespace_callback;
-  client_->session()->PublishNamespace(
-      TrackNamespace{"foo"}, publish_namespace_callback.AsStdFunction(),
-      *parameters);
+  testing::MockFunction<void(std::optional<MoqtRequestErrorInfo>)>
+      response_callback;
+  client_->session()->PublishNamespace(TrackNamespace{"foo"}, parameters,
+                                       response_callback.AsStdFunction(),
+                                       [](MoqtRequestErrorInfo) {});
   bool matches = false;
-  EXPECT_CALL(publish_namespace_callback, Call(_, _))
-      .WillOnce([&](TrackNamespace track_namespace,
-                    std::optional<MoqtRequestErrorInfo> error) {
+  EXPECT_CALL(response_callback, Call)
+      .WillOnce([&](std::optional<MoqtRequestErrorInfo> error) {
         matches = true;
-        EXPECT_EQ(track_namespace, TrackNamespace{"foo"});
         EXPECT_FALSE(error.has_value());
       });
   bool success =
       test_harness_.RunUntilWithDefaultTimeout([&]() { return matches; });
   EXPECT_TRUE(success);
   matches = false;
-  EXPECT_CALL(server_callbacks_.incoming_publish_namespace_callback,
-              Call(TrackNamespace{"foo"},
-                   std::optional<VersionSpecificParameters>(), _))
-      .WillOnce([&](const TrackNamespace& name,
-                    const std::optional<VersionSpecificParameters>& parameters,
-                    MoqtResponseCallback callback) {
-        matches = true;
-        EXPECT_EQ(callback, nullptr);
-      });
-  client_->session()->PublishNamespaceDone(TrackNamespace{"foo"});
+  EXPECT_CALL(
+      server_callbacks_.incoming_publish_namespace_callback,
+      Call(TrackNamespace{"foo"}, std::optional<MessageParameters>(), nullptr))
+      .WillOnce([&](const TrackNamespace&,
+                    const std::optional<MessageParameters>&,
+                    MoqtResponseCallback) { matches = true; });
+  EXPECT_TRUE(client_->session()->PublishNamespaceDone(TrackNamespace{"foo"}));
   success = test_harness_.RunUntilWithDefaultTimeout([&]() { return matches; });
   EXPECT_TRUE(success);
 }
 
 TEST_F(MoqtIntegrationTest, PublishNamespaceSuccessThenCancel) {
   EstablishSession();
-  auto parameters = std::make_optional<VersionSpecificParameters>(
-      AuthTokenType::kOutOfBand, "foo");
+  MessageParameters parameters;
+  parameters.authorization_tokens.emplace_back(AuthTokenType::kOutOfBand,
+                                               "foo");
   EXPECT_CALL(server_callbacks_.incoming_publish_namespace_callback,
-              Call(TrackNamespace{"foo"}, parameters, _))
+              Call(TrackNamespace{"foo"}, std::make_optional(parameters), _))
       .WillOnce([](const TrackNamespace&,
-                   const std::optional<VersionSpecificParameters>&,
+                   const std::optional<MessageParameters>&,
                    MoqtResponseCallback callback) {
         std::move(callback)(std::nullopt);
       });
-  testing::MockFunction<void(TrackNamespace track_namespace,
-                             std::optional<MoqtRequestErrorInfo> error_message)>
-      publish_namespace_callback;
-  client_->session()->PublishNamespace(
-      TrackNamespace{"foo"}, publish_namespace_callback.AsStdFunction(),
-      *parameters);
+  testing::MockFunction<void(std::optional<MoqtRequestErrorInfo>)>
+      response_callback;
+  testing::MockFunction<void(MoqtRequestErrorInfo)> cancel_callback;
+  client_->session()->PublishNamespace(TrackNamespace{"foo"}, parameters,
+                                       response_callback.AsStdFunction(),
+                                       cancel_callback.AsStdFunction());
   bool matches = false;
-  EXPECT_CALL(publish_namespace_callback, Call(_, _))
-      .WillOnce([&](TrackNamespace track_namespace,
-                    std::optional<MoqtRequestErrorInfo> error) {
-        matches = true;
-        EXPECT_EQ(track_namespace, TrackNamespace{"foo"});
-        EXPECT_FALSE(error.has_value());
-      });
+  EXPECT_CALL(response_callback, Call(std::optional<MoqtRequestErrorInfo>()))
+      .WillOnce(
+          [&](std::optional<MoqtRequestErrorInfo> error) { matches = true; });
   bool success =
       test_harness_.RunUntilWithDefaultTimeout([&]() { return matches; });
   EXPECT_TRUE(success);
   matches = false;
-  EXPECT_CALL(publish_namespace_callback, Call(_, _))
-      .WillOnce([&](TrackNamespace track_namespace,
-                    std::optional<MoqtRequestErrorInfo> error) {
-        matches = true;
-        EXPECT_EQ(track_namespace, TrackNamespace{"foo"});
-        ASSERT_TRUE(error.has_value());
-        EXPECT_EQ(error->error_code, RequestErrorCode::kInternalError);
-        EXPECT_EQ(error->reason_phrase, "internal error");
-      });
-  server_->session()->CancelPublishNamespace(TrackNamespace{"foo"},
+  EXPECT_CALL(cancel_callback,
+              Call(MoqtRequestErrorInfo{RequestErrorCode::kInternalError,
+                                        std::nullopt, "internal error"}))
+      .WillOnce([&](std::optional<MoqtRequestErrorInfo>) { matches = true; });
+  server_->session()->PublishNamespaceCancel(TrackNamespace{"foo"},
                                              RequestErrorCode::kInternalError,
                                              "internal error");
   success = test_harness_.RunUntilWithDefaultTimeout([&]() { return matches; });
@@ -260,33 +247,30 @@
 
 TEST_F(MoqtIntegrationTest, PublishNamespaceSuccessSubscribeInResponse) {
   EstablishSession();
-  auto parameters = std::make_optional<VersionSpecificParameters>(
-      AuthTokenType::kOutOfBand, "foo");
+  TrackNamespace prefix{"foo"};
+  MessageParameters parameters;
+  parameters.authorization_tokens.emplace_back(AuthTokenType::kOutOfBand,
+                                               "foo");
   EXPECT_CALL(server_callbacks_.incoming_publish_namespace_callback,
-              Call(TrackNamespace{"foo"}, parameters, _))
-      .WillOnce([](const TrackNamespace&,
-                   const std::optional<VersionSpecificParameters>&,
-                   MoqtResponseCallback callback) {
+              Call(TrackNamespace{"foo"}, std::make_optional(parameters), _))
+      .WillOnce([&](const TrackNamespace& track_namespace,
+                    const std::optional<MessageParameters>&,
+                    MoqtResponseCallback callback) {
         std::move(callback)(std::nullopt);
-      });
-  client_->session()->PublishNamespace(
-      TrackNamespace{"foo"},
-      outgoing_publish_namespace_callback_.AsStdFunction(), *parameters);
-  bool matches = false;
-  EXPECT_CALL(outgoing_publish_namespace_callback_, Call)
-      .WillOnce([&](TrackNamespace track_namespace,
-                    std::optional<MoqtRequestErrorInfo> error) {
-        EXPECT_EQ(track_namespace, TrackNamespace{"foo"});
         FullTrackName track_name(track_namespace, "/catalog");
-        EXPECT_FALSE(error.has_value());
         MessageParameters parameters(MoqtFilterType::kLargestObject);
         server_->session()->Subscribe(track_name, &subscribe_visitor_,
                                       parameters);
-      })
-      .WillOnce([&](TrackNamespace track_namespace,
-                    std::optional<MoqtRequestErrorInfo> error) {
-        EXPECT_EQ(track_namespace, TrackNamespace{"foo"});
-        EXPECT_TRUE(error.has_value());
+      });
+  testing::MockFunction<void(std::optional<MoqtRequestErrorInfo>)>
+      response_callback;
+  client_->session()->PublishNamespace(prefix, parameters,
+                                       response_callback.AsStdFunction(),
+                                       [](MoqtRequestErrorInfo) {});
+  bool matches = false;
+  EXPECT_CALL(response_callback, Call)
+      .WillOnce([&](std::optional<MoqtRequestErrorInfo> error) {
+        EXPECT_FALSE(error.has_value());
       });
   EXPECT_CALL(subscribe_visitor_, OnReply).WillOnce([&]() { matches = true; });
   bool success =
@@ -294,12 +278,7 @@
   EXPECT_TRUE(success);
   // Session tears down PUBLISH_NAMESPACE.
   EXPECT_CALL(server_callbacks_.incoming_publish_namespace_callback,
-              Call(TrackNamespace{"foo"},
-                   std::optional<VersionSpecificParameters>(), _))
-      .WillOnce(
-          [](const TrackNamespace&,
-             const std::optional<VersionSpecificParameters>&,
-             MoqtResponseCallback callback) { EXPECT_EQ(callback, nullptr); });
+              Call(prefix, std::optional<MessageParameters>(), nullptr));
 }
 
 TEST_F(MoqtIntegrationTest, PublishNamespaceSuccessSendDataInResponse) {
@@ -307,12 +286,13 @@
 
   // Set up the server to subscribe to "data" track for the namespace
   // publish_namespace it receives.
-  auto parameters = std::make_optional<VersionSpecificParameters>(
-      AuthTokenType::kOutOfBand, "foo");
+  MessageParameters parameters;
+  parameters.authorization_tokens.emplace_back(AuthTokenType::kOutOfBand,
+                                               "foo");
   EXPECT_CALL(server_callbacks_.incoming_publish_namespace_callback,
-              Call(TrackNamespace{"test"}, parameters, _))
+              Call(TrackNamespace{"test"}, std::make_optional(parameters), _))
       .WillOnce([&](const TrackNamespace& track_namespace,
-                    const std::optional<VersionSpecificParameters>&,
+                    const std::optional<MessageParameters>&,
                     MoqtResponseCallback callback) {
         FullTrackName track_name(track_namespace, "data");
         std::move(callback)(std::nullopt);
@@ -331,8 +311,8 @@
     received_subscribe_ok = true;
   });
   client_->session()->PublishNamespace(
-      TrackNamespace{"test"},
-      [](TrackNamespace, std::optional<MoqtRequestErrorInfo>) {}, *parameters);
+      TrackNamespace{"test"}, parameters,
+      [](std::optional<MoqtRequestErrorInfo>) {}, [](MoqtRequestErrorInfo) {});
   bool success = test_harness_.RunUntilWithDefaultTimeout(
       [&]() { return received_subscribe_ok; });
   EXPECT_TRUE(success);
@@ -357,12 +337,8 @@
   EXPECT_TRUE(success);
   // Session tears down PUBLISH_NAMESPACE.
   EXPECT_CALL(server_callbacks_.incoming_publish_namespace_callback,
-              Call(TrackNamespace{"test"},
-                   std::optional<VersionSpecificParameters>(), _))
-      .WillOnce(
-          [](const TrackNamespace&,
-             const std::optional<VersionSpecificParameters>&,
-             MoqtResponseCallback callback) { EXPECT_EQ(callback, nullptr); });
+              Call(TrackNamespace{"test"}, std::optional<MessageParameters>(),
+                   nullptr));
 }
 
 TEST_F(MoqtIntegrationTest, SendMultipleGroups) {
@@ -531,18 +507,16 @@
 
 TEST_F(MoqtIntegrationTest, PublishNamespaceFailure) {
   EstablishSession();
-  testing::MockFunction<void(TrackNamespace track_namespace,
-                             std::optional<MoqtRequestErrorInfo> error_message)>
-      publish_namespace_callback;
-  client_->session()->PublishNamespace(
-      TrackNamespace{"foo"}, publish_namespace_callback.AsStdFunction(),
-      VersionSpecificParameters());
+  testing::MockFunction<void(std::optional<MoqtRequestErrorInfo>)>
+      response_callback;
+  client_->session()->PublishNamespace(TrackNamespace{"foo"},
+                                       MessageParameters(),
+                                       response_callback.AsStdFunction(),
+                                       [](MoqtRequestErrorInfo error_info) {});
   bool matches = false;
-  EXPECT_CALL(publish_namespace_callback, Call(_, _))
-      .WillOnce([&](TrackNamespace track_namespace,
-                    std::optional<MoqtRequestErrorInfo> error) {
+  EXPECT_CALL(response_callback, Call)
+      .WillOnce([&](std::optional<MoqtRequestErrorInfo> error) {
         matches = true;
-        EXPECT_EQ(track_namespace, TrackNamespace{"foo"});
         ASSERT_TRUE(error.has_value());
         EXPECT_EQ(error->error_code, RequestErrorCode::kNotSupported);
       });
diff --git a/quiche/quic/moqt/moqt_messages.h b/quiche/quic/moqt/moqt_messages.h
index 4f99112..0d8580f 100644
--- a/quiche/quic/moqt/moqt_messages.h
+++ b/quiche/quic/moqt/moqt_messages.h
@@ -401,7 +401,7 @@
 struct QUICHE_EXPORT MoqtPublishNamespace {
   uint64_t request_id;
   TrackNamespace track_namespace;
-  VersionSpecificParameters parameters;
+  MessageParameters parameters;
 };
 
 struct QUICHE_EXPORT MoqtRequestOk {
@@ -410,11 +410,11 @@
 };
 
 struct QUICHE_EXPORT MoqtPublishNamespaceDone {
-  TrackNamespace track_namespace;
+  uint64_t request_id;
 };
 
 struct QUICHE_EXPORT MoqtPublishNamespaceCancel {
-  TrackNamespace track_namespace;
+  uint64_t request_id;
   RequestErrorCode error_code;
   std::string error_reason;
 };
diff --git a/quiche/quic/moqt/moqt_parser.cc b/quiche/quic/moqt/moqt_parser.cc
index 0aeb42c..174c153 100644
--- a/quiche/quic/moqt/moqt_parser.cc
+++ b/quiche/quic/moqt/moqt_parser.cc
@@ -789,13 +789,7 @@
       !ReadTrackNamespace(reader, publish_namespace.track_namespace)) {
     return 0;
   }
-  KeyValuePairList parameters;
-  if (!ParseKeyValuePairList(reader, parameters)) {
-    return 0;
-  }
-  if (!FillAndValidateVersionSpecificParameters(
-          parameters, publish_namespace.parameters,
-          MoqtMessageType::kPublishNamespace)) {
+  if (!FillAndValidateMessageParameters(reader, publish_namespace.parameters)) {
     return 0;
   }
   visitor_.OnPublishNamespaceMessage(publish_namespace);
@@ -834,22 +828,20 @@
 
 size_t MoqtControlParser::ProcessPublishNamespaceDone(
     quic::QuicDataReader& reader) {
-  MoqtPublishNamespaceDone unpublish_namespace;
-  if (!ReadTrackNamespace(reader, unpublish_namespace.track_namespace)) {
+  MoqtPublishNamespaceDone pn_done;
+  if (!reader.ReadVarInt62(&pn_done.request_id)) {
     return 0;
   }
-  visitor_.OnPublishNamespaceDoneMessage(unpublish_namespace);
+  visitor_.OnPublishNamespaceDoneMessage(pn_done);
   return reader.PreviouslyReadPayload().length();
 }
 
 size_t MoqtControlParser::ProcessPublishNamespaceCancel(
     quic::QuicDataReader& reader) {
   MoqtPublishNamespaceCancel publish_namespace_cancel;
-  if (!ReadTrackNamespace(reader, publish_namespace_cancel.track_namespace)) {
-    return 0;
-  }
   uint64_t error_code;
-  if (!reader.ReadVarInt62(&error_code) ||
+  if (!reader.ReadVarInt62(&publish_namespace_cancel.request_id) ||
+      !reader.ReadVarInt62(&error_code) ||
       !reader.ReadStringVarInt62(publish_namespace_cancel.error_reason)) {
     return 0;
   }
diff --git a/quiche/quic/moqt/moqt_parser_test.cc b/quiche/quic/moqt/moqt_parser_test.cc
index a2049c8..0fed64d 100644
--- a/quiche/quic/moqt/moqt_parser_test.cc
+++ b/quiche/quic/moqt/moqt_parser_test.cc
@@ -831,25 +831,6 @@
   EXPECT_EQ(visitor_.messages_received_, 1);
 }
 
-TEST_F(MoqtMessageSpecificTest, PublishNamespaceHasDeliveryTimeout) {
-  webtransport::test::InMemoryStream stream(/*stream_id=*/0);
-  MoqtControlParser parser(kWebTrans, &stream, visitor_);
-  char publish_namespace[] = {
-      0x06, 0x00, 0x11, 0x02, 0x01, 0x03, 0x66,
-      0x6f, 0x6f,                                // track_namespace = "foo"
-      0x02,                                      // 2 params
-      0x02, 0x67, 0x10,                          // delivery_timeout = 10000
-      0x01, 0x05, 0x03, 0x00, 0x62, 0x61, 0x72,  // authorization_info = "bar"
-  };
-  stream.Receive(
-      absl::string_view(publish_namespace, sizeof(publish_namespace)), false);
-  parser.ReadAndDispatchMessages();
-  EXPECT_EQ(visitor_.messages_received_, 0);
-  EXPECT_EQ(visitor_.parsing_error_,
-            "Version Specific Parameter not allowed for this message type");
-  EXPECT_EQ(visitor_.parsing_error_code_, MoqtError::kProtocolViolation);
-}
-
 TEST_F(MoqtMessageSpecificTest, FinMidPayload) {
   webtransport::test::InMemoryStream stream(/*stream_id=*/0);
   MoqtDataParser parser(&stream, &visitor_);
diff --git a/quiche/quic/moqt/moqt_relay_publisher.cc b/quiche/quic/moqt/moqt_relay_publisher.cc
index 478341c..5f10c25 100644
--- a/quiche/quic/moqt/moqt_relay_publisher.cc
+++ b/quiche/quic/moqt/moqt_relay_publisher.cc
@@ -11,6 +11,8 @@
 #include "absl/base/nullability.h"
 #include "absl/container/flat_hash_map.h"
 #include "absl/strings/string_view.h"
+#include "quiche/quic/moqt/moqt_fetch_task.h"
+#include "quiche/quic/moqt/moqt_key_value_pair.h"
 #include "quiche/quic/moqt/moqt_names.h"
 #include "quiche/quic/moqt/moqt_publisher.h"
 #include "quiche/quic/moqt/moqt_relay_track_publisher.h"
@@ -65,8 +67,7 @@
 
 void MoqtRelayPublisher::OnPublishNamespace(
     const TrackNamespace& track_namespace,
-    const VersionSpecificParameters& /*parameters*/,
-    MoqtSessionInterface* session,
+    const MessageParameters& /*parameters*/, MoqtSessionInterface* session,
     MoqtResponseCallback absl_nullable callback) {
   if (session == nullptr) {
     return;
diff --git a/quiche/quic/moqt/moqt_relay_publisher.h b/quiche/quic/moqt/moqt_relay_publisher.h
index 37b1fcf..ee1fb71 100644
--- a/quiche/quic/moqt/moqt_relay_publisher.h
+++ b/quiche/quic/moqt/moqt_relay_publisher.h
@@ -53,7 +53,7 @@
   }
 
   void OnPublishNamespace(const TrackNamespace& track_namespace,
-                          const VersionSpecificParameters& parameters,
+                          const MessageParameters& parameters,
                           MoqtSessionInterface* session,
                           MoqtResponseCallback absl_nullable callback);
 
diff --git a/quiche/quic/moqt/moqt_relay_publisher_test.cc b/quiche/quic/moqt/moqt_relay_publisher_test.cc
index 6cb6b94..adecafc 100644
--- a/quiche/quic/moqt/moqt_relay_publisher_test.cc
+++ b/quiche/quic/moqt/moqt_relay_publisher_test.cc
@@ -79,7 +79,7 @@
   EXPECT_EQ(publisher_.GetTrack(FullTrackName("foo", "bar")), nullptr);
   std::optional<MoqtRequestErrorInfo> response;
   publisher_.OnPublishNamespace(
-      TrackNamespace({"foo"}), VersionSpecificParameters(), &session_,
+      TrackNamespace({"foo"}), MessageParameters(), &session_,
       [&](std::optional<MoqtRequestErrorInfo> error_response) {
         response = error_response;
       });
diff --git a/quiche/quic/moqt/moqt_session.cc b/quiche/quic/moqt/moqt_session.cc
index 05dafcf..06800ed 100644
--- a/quiche/quic/moqt/moqt_session.cc
+++ b/quiche/quic/moqt/moqt_session.cc
@@ -336,21 +336,16 @@
   return state_ptr->CreateTask(prefix);
 }
 
-void MoqtSession::PublishNamespace(
-    TrackNamespace track_namespace,
-    MoqtOutgoingPublishNamespaceCallback callback,
-    VersionSpecificParameters parameters) {
+bool MoqtSession::PublishNamespace(
+    const TrackNamespace& track_namespace, const MessageParameters& parameters,
+    MoqtResponseCallback response_callback,
+    quiche::SingleUseCallback<void(MoqtRequestErrorInfo)> cancel_callback) {
   if (is_closing_) {
-    return;
+    return false;
   }
   QUICHE_DCHECK(track_namespace.IsValid());
-  if (outgoing_publish_namespaces_.contains(track_namespace)) {
-    std::move(callback)(
-        track_namespace,
-        MoqtRequestErrorInfo{
-            RequestErrorCode::kInternalError, std::nullopt,
-            "PUBLISH_NAMESPACE already outstanding for namespace"});
-    return;
+  if (publish_namespace_by_namespace_.contains(track_namespace)) {
+    return false;
   }
   if (next_request_id_ >= peer_max_request_id_) {
     if (!last_requests_blocked_sent_.has_value() ||
@@ -364,13 +359,17 @@
                     << next_request_id_
                     << " which is greater than the maximum ID "
                     << peer_max_request_id_;
-    return;
+    return false;
   }
   if (received_goaway_ || sent_goaway_) {
     QUIC_DLOG(INFO) << ENDPOINT
                     << "Tried to send PUBLISH_NAMESPACE after GOAWAY";
-    return;
+    return false;
   }
+  publish_namespace_by_namespace_[track_namespace] = next_request_id_;
+  publish_namespace_by_id_[next_request_id_] =
+      PublishNamespaceState{track_namespace, std::move(response_callback),
+                            std::move(cancel_callback)};
   MoqtPublishNamespace message;
   message.request_id = next_request_id_;
   next_request_id_ += 2;
@@ -379,39 +378,78 @@
   SendControlMessage(framer_.SerializePublishNamespace(message));
   QUIC_DLOG(INFO) << ENDPOINT << "Sent PUBLISH_NAMESPACE message for "
                   << message.track_namespace;
-  pending_outgoing_publish_namespaces_[message.request_id] = track_namespace;
-  outgoing_publish_namespaces_[track_namespace] = std::move(callback);
+  return true;
 }
 
-bool MoqtSession::PublishNamespaceDone(TrackNamespace track_namespace) {
+bool MoqtSession::PublishNamespaceUpdate(
+    const TrackNamespace& track_namespace, MessageParameters& parameters,
+    MoqtResponseCallback response_callback) {
   if (is_closing_) {
     return false;
   }
   QUICHE_DCHECK(track_namespace.IsValid());
-  auto it = outgoing_publish_namespaces_.find(track_namespace);
-  if (it == outgoing_publish_namespaces_.end()) {
+  auto it = publish_namespace_by_namespace_.find(track_namespace);
+  if (it == publish_namespace_by_namespace_.end()) {
     return false;  // Could have been destroyed by PUBLISH_NAMESPACE_CANCEL.
   }
-  MoqtPublishNamespaceDone message;
-  message.track_namespace = track_namespace;
-  SendControlMessage(framer_.SerializePublishNamespaceDone(message));
-  QUIC_DLOG(INFO) << ENDPOINT << "Sent PUBLISH_NAMESPACE_DONE message for "
-                  << message.track_namespace;
-  outgoing_publish_namespaces_.erase(it);
+  if (next_request_id_ >= peer_max_request_id_) {
+    if (!last_requests_blocked_sent_.has_value() ||
+        peer_max_request_id_ > *last_requests_blocked_sent_) {
+      MoqtRequestsBlocked requests_blocked;
+      requests_blocked.max_request_id = peer_max_request_id_;
+      SendControlMessage(framer_.SerializeRequestsBlocked(requests_blocked));
+      last_requests_blocked_sent_ = peer_max_request_id_;
+    }
+    QUIC_DLOG(INFO) << ENDPOINT << "Tried to send PUBLISH_NAMESPACE with ID "
+                    << next_request_id_
+                    << " which is greater than the maximum ID "
+                    << peer_max_request_id_;
+    return false;
+  }
+  MoqtRequestUpdate message;
+  message.request_id = next_request_id_;
+  message.existing_request_id = it->second;
+  message.parameters = parameters;
+  publish_namespace_updates_[next_request_id_] = std::move(response_callback);
+  next_request_id_ += 2;
+  SendControlMessage(framer_.SerializeRequestUpdate(message));
   return true;
 }
 
-void MoqtSession::CancelPublishNamespace(TrackNamespace track_namespace,
+bool MoqtSession::PublishNamespaceDone(const TrackNamespace& track_namespace) {
+  if (is_closing_) {
+    return false;
+  }
+  QUICHE_DCHECK(track_namespace.IsValid());
+  auto it = publish_namespace_by_namespace_.find(track_namespace);
+  if (it == publish_namespace_by_namespace_.end()) {
+    return false;  // Could have been destroyed by PUBLISH_NAMESPACE_CANCEL.
+  }
+  MoqtPublishNamespaceDone message;
+  message.request_id = it->second;
+  SendControlMessage(framer_.SerializePublishNamespaceDone(message));
+  QUIC_DLOG(INFO) << ENDPOINT << "Sent PUBLISH_NAMESPACE_DONE message for "
+                  << track_namespace;
+  publish_namespace_by_id_.erase(it->second);
+  publish_namespace_by_namespace_.erase(it);
+  return true;
+}
+
+bool MoqtSession::PublishNamespaceCancel(const TrackNamespace& track_namespace,
                                          RequestErrorCode code,
                                          absl::string_view reason) {
   QUICHE_DCHECK(track_namespace.IsValid());
-  MoqtPublishNamespaceCancel message{track_namespace, code,
-                                     std::string(reason)};
-
-  incoming_publish_namespaces_.erase(track_namespace);
+  auto it = incoming_publish_namespaces_by_namespace_.find(track_namespace);
+  if (it == publish_namespace_by_namespace_.end()) {
+    return false;  // Could have been destroyed by PUBLISH_NAMESPACE_DONE.
+  }
+  MoqtPublishNamespaceCancel message{it->second, code, std::string(reason)};
+  incoming_publish_namespaces_by_id_.erase(it->second);
+  incoming_publish_namespaces_by_namespace_.erase(track_namespace);
   SendControlMessage(framer_.SerializePublishNamespaceCancel(message));
   QUIC_DLOG(INFO) << ENDPOINT << "Sent PUBLISH_NAMESPACE_CANCEL message for "
-                  << message.track_namespace << " with reason " << reason;
+                  << track_namespace << " with reason " << reason;
+  return true;
 }
 
 bool MoqtSession::Subscribe(const FullTrackName& name,
@@ -1131,18 +1169,14 @@
     return;
   }
   // Response to PUBLISH_NAMESPACE.
-  auto pn_it =
-      session_->pending_outgoing_publish_namespaces_.find(message.request_id);
-  if (pn_it != session_->pending_outgoing_publish_namespaces_.end()) {
-    TrackNamespace track_namespace = pn_it->second;
-    session_->pending_outgoing_publish_namespaces_.erase(pn_it);
-    auto callback_it =
-        session_->outgoing_publish_namespaces_.find(track_namespace);
-    if (callback_it == session_->outgoing_publish_namespaces_.end()) {
-      // It might have already been destroyed due to PUBLISH_NAMESPACE_DONE.
+  auto pn_it = session_->publish_namespace_by_id_.find(message.request_id);
+  if (pn_it != session_->publish_namespace_by_id_.end()) {
+    if (pn_it->second.response_callback == nullptr) {
+      session_->Error(MoqtError::kProtocolViolation,
+                      "Multiple responses for PUBLISH_NAMESPACE");
       return;
     }
-    std::move(callback_it->second)(track_namespace, std::nullopt);
+    std::move(pn_it->second.response_callback)(std::nullopt);
     return;
   }
   // Response to SUBSCRIBE_NAMESPACE is handled in the NamespaceStream.
@@ -1202,17 +1236,17 @@
     return;
   }
   // Response to PUBLISH_NAMESPACE.
-  auto pn_it =
-      session_->pending_outgoing_publish_namespaces_.find(message.request_id);
-  if (pn_it != session_->pending_outgoing_publish_namespaces_.end()) {
-    TrackNamespace& track_namespace = pn_it->second;
-    auto it2 = session_->outgoing_publish_namespaces_.find(track_namespace);
-    if (it2 == session_->outgoing_publish_namespaces_.end()) {
-      return;  // State might have been destroyed due to PUBLISH_NAMESPACE_DONE.
+  auto pn_it = session_->publish_namespace_by_id_.find(message.request_id);
+  if (pn_it != session_->publish_namespace_by_id_.end()) {
+    if (pn_it->second.response_callback == nullptr) {
+      session_->Error(MoqtError::kProtocolViolation,
+                      "Multiple responses for PUBLISH_NAMESPACE");
+      return;
     }
-    std::move(it2->second)(track_namespace, error_info);
-    session_->pending_outgoing_publish_namespaces_.erase(pn_it);
-    session_->outgoing_publish_namespaces_.erase(it2);
+    std::move(pn_it->second.response_callback)(error_info);
+    session_->publish_namespace_by_namespace_.erase(
+        pn_it->second.track_namespace);
+    session_->publish_namespace_by_id_.erase(pn_it);
     return;
   }
   // Response to SUBSCRIBE_NAMESPACE is handled in the NamespaceStream.
@@ -1259,6 +1293,33 @@
     SendRequestOk(message.request_id, MessageParameters());
     return;
   }
+  auto pn_it =
+      session_->publish_namespace_by_id_.find(message.existing_request_id);
+  if (pn_it != session_->publish_namespace_by_id_.end()) {
+    // It's updating PUBLISH_NAMESPACE.
+    quiche::QuicheWeakPtr<MoqtSessionInterface> session_weakptr =
+        session_->GetWeakPtr();
+    TrackNamespace track_namespace = pn_it->second.track_namespace;
+    session_->callbacks().incoming_publish_namespace_callback(
+        pn_it->second.track_namespace, message.parameters,
+        [&](std::optional<MoqtRequestErrorInfo> error) {
+          MoqtSession* session =
+              absl::down_cast<MoqtSession*>(session_weakptr.GetIfAvailable());
+          if (session == nullptr) {
+            return;
+          }
+          if (error.has_value()) {
+            SendRequestError(message.request_id, *error);
+            session->incoming_publish_namespaces_by_id_.erase(
+                message.request_id);
+            session->incoming_publish_namespaces_by_namespace_.erase(
+                track_namespace);
+          } else {
+            SendRequestOk(message.request_id, MessageParameters());
+          }
+        });
+    return;
+  }
   // TODO(martinduke): Check all the request types.
   // Does not match any known request.
   SendRequestError(message.request_id, RequestErrorCode::kNotSupported,
@@ -1278,8 +1339,19 @@
   }
   QUIC_DLOG(INFO) << ENDPOINT << "Received a PUBLISH_NAMESPACE for "
                   << message.track_namespace;
+  auto [it, inserted] =
+      session_->incoming_publish_namespaces_by_namespace_.emplace(
+          message.track_namespace, message.request_id);
+  if (!inserted) {
+    SendRequestError(message.request_id,
+                     RequestErrorCode::kDuplicateSubscription, std::nullopt,
+                     "Duplicate PUBLISH_NAMESPACE");
+    return;
+  }
   quiche::QuicheWeakPtr<MoqtSessionInterface> session_weakptr =
       session_->GetWeakPtr();
+  session_->incoming_publish_namespaces_by_id_[message.request_id] =
+      message.track_namespace;
   session_->callbacks_.incoming_publish_namespace_callback(
       message.track_namespace, message.parameters,
       [&](std::optional<MoqtRequestErrorInfo> error) {
@@ -1290,36 +1362,38 @@
         }
         if (error.has_value()) {
           SendRequestError(message.request_id, *error);
+          session->incoming_publish_namespaces_by_id_.erase(message.request_id);
+          session->incoming_publish_namespaces_by_namespace_.erase(
+              message.track_namespace);
         } else {
           SendRequestOk(message.request_id, MessageParameters());
-          session->incoming_publish_namespaces_.insert(message.track_namespace);
         }
       });
 }
 
 void MoqtSession::ControlStream::OnPublishNamespaceDoneMessage(
     const MoqtPublishNamespaceDone& message) {
-  session_->incoming_publish_namespaces_.erase(message.track_namespace);
+  auto it =
+      session_->incoming_publish_namespaces_by_id_.find(message.request_id);
+  if (it == session_->incoming_publish_namespaces_by_id_.end()) {
+    return;
+  }
   session_->callbacks_.incoming_publish_namespace_callback(
-      message.track_namespace, std::nullopt, nullptr);
+      it->second, std::nullopt, nullptr);
+  session_->incoming_publish_namespaces_by_namespace_.erase(it->second);
+  session_->incoming_publish_namespaces_by_id_.erase(it);
 }
 
 void MoqtSession::ControlStream::OnPublishNamespaceCancelMessage(
     const MoqtPublishNamespaceCancel& message) {
-  // The spec currently says that if a later SUBSCRIBE arrives for this
-  // namespace, that SHOULD be a session error. I'm hoping that via Issue #557,
-  // this will go away. Regardless, a SHOULD will not compel the session to keep
-  // state forever, so there is no support for this requirement.
-  auto it =
-      session_->outgoing_publish_namespaces_.find(message.track_namespace);
-  if (it == session_->outgoing_publish_namespaces_.end()) {
+  auto it = session_->publish_namespace_by_id_.find(message.request_id);
+  if (it == session_->publish_namespace_by_id_.end()) {
     return;  // State might have been destroyed due to PUBLISH_NAMESPACE_DONE.
   }
-  std::move(it->second)(
-      message.track_namespace,
-      MoqtRequestErrorInfo{message.error_code, std::nullopt,
-                           std::string(message.error_reason)});
-  session_->outgoing_publish_namespaces_.erase(it);
+  std::move(it->second.cancel_callback)(MoqtRequestErrorInfo{
+      message.error_code, std::nullopt, std::string(message.error_reason)});
+  session_->publish_namespace_by_namespace_.erase(it->second.track_namespace);
+  session_->publish_namespace_by_id_.erase(it);
 }
 
 void MoqtSession::ControlStream::OnTrackStatusMessage(
@@ -2383,14 +2457,13 @@
   // session owns the webtransport stream, which owns the StreamVisitor, which
   // owns the task. Destroying the task notifies the application.
   published_subscriptions_.clear();
-  for (const TrackNamespace& track_namespace : incoming_publish_namespaces_) {
-    callbacks_.incoming_publish_namespace_callback(track_namespace,
-                                                   std::nullopt, nullptr);
+  for (auto& it : incoming_publish_namespaces_by_namespace_) {
+    callbacks_.incoming_publish_namespace_callback(it.first, std::nullopt,
+                                                   nullptr);
   }
-  for (auto& [track_namespace, callback] : outgoing_publish_namespaces_) {
-    callback(track_namespace,
-             MoqtRequestErrorInfo{RequestErrorCode::kUninterested, std::nullopt,
-                                  "Session closed"});
+  for (auto& it : publish_namespace_by_id_) {
+    std::move(it.second.cancel_callback)(MoqtRequestErrorInfo{
+        RequestErrorCode::kUninterested, std::nullopt, "Session closed"});
   }
   while (!upstream_by_id_.empty()) {
     auto upstream = upstream_by_id_.begin();
diff --git a/quiche/quic/moqt/moqt_session.h b/quiche/quic/moqt/moqt_session.h
index a0562de..1abe949 100644
--- a/quiche/quic/moqt/moqt_session.h
+++ b/quiche/quic/moqt/moqt_session.h
@@ -42,6 +42,7 @@
 #include "quiche/common/platform/api/quiche_export.h"
 #include "quiche/common/platform/api/quiche_logging.h"
 #include "quiche/common/quiche_buffer_allocator.h"
+#include "quiche/common/quiche_callbacks.h"
 #include "quiche/common/quiche_circular_deque.h"
 #include "quiche/common/quiche_mem_slice.h"
 #include "quiche/common/quiche_weak_ptr.h"
@@ -99,12 +100,6 @@
 
   quic::Perspective perspective() const { return parameters_.perspective; }
 
-  // Allows the subscriber to declare it will not subscribe to |track_namespace|
-  // anymore.
-  void CancelPublishNamespace(TrackNamespace track_namespace,
-                              RequestErrorCode code,
-                              absl::string_view reason_phrase);
-
   // MoqtSessionInterface implementation.
   MoqtSessionCallbacks& callbacks() override { return callbacks_; }
   void Error(MoqtError code, absl::string_view error) override;
@@ -130,10 +125,18 @@
                             uint64_t num_previous_groups, MoqtPriority priority,
                             std::optional<MoqtDeliveryOrder> delivery_order,
                             VersionSpecificParameters parameters) override;
-  void PublishNamespace(TrackNamespace track_namespace,
-                        MoqtOutgoingPublishNamespaceCallback callback,
-                        VersionSpecificParameters parameters) override;
-  bool PublishNamespaceDone(TrackNamespace track_namespace) override;
+  bool PublishNamespace(const TrackNamespace& track_namespace,
+                        const MessageParameters& parameters,
+                        MoqtResponseCallback response_callback,
+                        quiche::SingleUseCallback<void(MoqtRequestErrorInfo)>
+                            cancel_callback) override;
+  bool PublishNamespaceUpdate(const TrackNamespace& track_namespace,
+                              MessageParameters& parameters,
+                              MoqtResponseCallback response_callback) override;
+  bool PublishNamespaceDone(const TrackNamespace& track_namespace) override;
+  bool PublishNamespaceCancel(const TrackNamespace& track_namespace,
+                              RequestErrorCode error_code,
+                              absl::string_view error_reason) override;
   // TODO(martinduke): Support PUBLISH. For now, PUBLISH-only requests will be
   // rejected with nullptr, and kBoth requests will change to kNamespace.
   // After receiving MoqtNamespaceTask, call
@@ -851,13 +854,20 @@
   absl::flat_hash_map<FullTrackName, MoqtPublishingMonitorInterface*>
       monitoring_interfaces_for_published_tracks_;
 
-  // Outgoing PUBLISH_NAMESPACE for which no OK or ERROR has been received.
+  // PUBLISH_NAMESPACE state.
+  struct PublishNamespaceState {
+    TrackNamespace track_namespace;
+    MoqtResponseCallback response_callback;
+    quiche::SingleUseCallback<void(MoqtRequestErrorInfo)> cancel_callback;
+  };
+  absl::flat_hash_map<uint64_t, PublishNamespaceState> publish_namespace_by_id_;
+  absl::flat_hash_map<TrackNamespace, uint64_t> publish_namespace_by_namespace_;
+  absl::flat_hash_map<uint64_t, MoqtResponseCallback>
+      publish_namespace_updates_;
+  absl::flat_hash_map<TrackNamespace, uint64_t>
+      incoming_publish_namespaces_by_namespace_;
   absl::flat_hash_map<uint64_t, TrackNamespace>
-      pending_outgoing_publish_namespaces_;
-  // All outgoing PUBLISH_NAMESPACE.
-  absl::flat_hash_map<TrackNamespace, MoqtOutgoingPublishNamespaceCallback>
-      outgoing_publish_namespaces_;
-  absl::flat_hash_set<TrackNamespace> incoming_publish_namespaces_;
+      incoming_publish_namespaces_by_id_;
 
   // It's an error if the namespaces overlap, so keep track of them.
   SessionNamespaceTree incoming_subscribe_namespace_;
diff --git a/quiche/quic/moqt/moqt_session_callbacks.h b/quiche/quic/moqt/moqt_session_callbacks.h
index 2d070b7..098c2a4 100644
--- a/quiche/quic/moqt/moqt_session_callbacks.h
+++ b/quiche/quic/moqt/moqt_session_callbacks.h
@@ -39,9 +39,11 @@
 // received from the peer. PUBLISH_NAMESPACE sets a value for |parameters|,
 // PUBLISH_NAMESPACE_DONE does not. This callback is not invoked by NAMESPACE or
 // NAMESPACE_DONE messages that arrive on a SUBSCRIBE_NAMESPACE stream.
+// If the PUBLISH_NAMESPACE is updated, it will be called again, so be prepared
+// for duplicates.
 using MoqtIncomingPublishNamespaceCallback = quiche::MultiUseCallback<void(
     const TrackNamespace& track_namespace,
-    const std::optional<VersionSpecificParameters>& parameters,
+    const std::optional<MessageParameters>& parameters,
     MoqtResponseCallback callback)>;
 
 // Called whenever SUBSCRIBE_NAMESPACE is received from the peer. Unsubscribe
@@ -55,14 +57,14 @@
         MoqtResponseCallback response_callback)>;
 
 inline void DefaultIncomingPublishNamespaceCallback(
-    const TrackNamespace&, const std::optional<VersionSpecificParameters>&,
+    const TrackNamespace&, const std::optional<MessageParameters>&,
     MoqtResponseCallback callback) {
   if (callback == nullptr) {
     return;
   }
   return std::move(callback)(MoqtRequestErrorInfo{
       RequestErrorCode::kNotSupported, std::nullopt,
-      "This endpoint does not support incoming SUBSCRIBE_NAMESPACE messages"});
+      "This endpoint does not support incoming PUBLISH_NAMESPACE messages"});
 };
 
 inline std::unique_ptr<MoqtNamespaceTask>
diff --git a/quiche/quic/moqt/moqt_session_interface.h b/quiche/quic/moqt/moqt_session_interface.h
index c69d5c5..cb67da6 100644
--- a/quiche/quic/moqt/moqt_session_interface.h
+++ b/quiche/quic/moqt/moqt_session_interface.h
@@ -71,18 +71,6 @@
 using FetchResponseCallback =
     quiche::SingleUseCallback<void(std::unique_ptr<MoqtFetchTask> fetch_task)>;
 
-// TODO(martinduke): MoqtOutgoingPublishNamespaceCallback is deprecated. Remove.
-
-// If |error| is nullopt, this is triggered by a PUBLISH_NAMESPACE_OK.
-// Otherwise, it is triggered by REQUEST_ERROR or PUBLISH_NAMESPACE_CANCEL. For
-// ERROR or CANCEL, MoqtSession is deleting all PUBLISH_NAMESPACE state
-// immediately after calling this callback.
-// Alternatively, the application can call PublishNamespaceDone() to delete the
-// state.
-using MoqtOutgoingPublishNamespaceCallback =
-    quiche::MultiUseCallback<void(const TrackNamespace& track_namespace,
-                                  std::optional<MoqtRequestErrorInfo> error)>;
-
 class MoqtSessionInterface {
  public:
   virtual ~MoqtSessionInterface() = default;
@@ -138,15 +126,25 @@
       MoqtPriority priority, std::optional<MoqtDeliveryOrder> delivery_order,
       VersionSpecificParameters parameters) = 0;
   // Send a PUBLISH_NAMESPACE message for |track_namespace|, and call
-  // |publish_namespace_callback| when the response arrives. Will fail
+  // |response_callback| when the response arrives. Will fail
   // immediately if there is already an unresolved PUBLISH_NAMESPACE for that
-  // namespace.
-  virtual void PublishNamespace(TrackNamespace track_namespace,
-                                MoqtOutgoingPublishNamespaceCallback callback,
-                                VersionSpecificParameters parameters) = 0;
-  // Returns true if message was sent, false if there is no PUBLISH_NAMESPACE to
-  // cancel.
-  virtual bool PublishNamespaceDone(TrackNamespace track_namespace) = 0;
+  // namespace. Calls |cancel_callback| if the peer sends a
+  // PUBLISH_NAMESPACE_CANCEL. Returns true if the message was sent.
+  virtual bool PublishNamespace(
+      const TrackNamespace& track_namespace,
+      const MessageParameters& parameters,
+      MoqtResponseCallback response_callback,
+      quiche::SingleUseCallback<void(MoqtRequestErrorInfo)>
+          cancel_callback) = 0;
+  virtual bool PublishNamespaceUpdate(
+      const TrackNamespace& track_namespace, MessageParameters& parameters,
+      MoqtResponseCallback response_callback) = 0;
+  // Returns true if message was sent, false if there is no PUBLISH_NAMESPACE
+  // that relates.
+  virtual bool PublishNamespaceDone(const TrackNamespace& track_namespace) = 0;
+  virtual bool PublishNamespaceCancel(const TrackNamespace& track_namespace,
+                                      RequestErrorCode error_code,
+                                      absl::string_view error_reason) = 0;
 
   // Sends a SUBSCRIBE_NAMESPACE message for |prefix| and returns a
   // MoqtNamespaceTask that can be used to process the response.
diff --git a/quiche/quic/moqt/moqt_session_test.cc b/quiche/quic/moqt/moqt_session_test.cc
index 5ebddab..e0423ac 100644
--- a/quiche/quic/moqt/moqt_session_test.cc
+++ b/quiche/quic/moqt/moqt_session_test.cc
@@ -433,63 +433,53 @@
 }
 
 TEST_F(MoqtSessionTest, PublishNamespaceWithOkAndCancel) {
-  testing::MockFunction<void(TrackNamespace track_namespace,
-                             std::optional<MoqtRequestErrorInfo> error_message)>
-      publish_namespace_resolved_callback;
+  testing::MockFunction<void(std::optional<MoqtRequestErrorInfo> error_message)>
+      publish_namespace_response_callback;
   std::unique_ptr<MoqtControlParserVisitor> stream_input =
       MoqtSessionPeer::CreateControlStream(&session_, &mock_stream_);
   EXPECT_CALL(
       mock_stream_,
       Writev(ControlMessageOfType(MoqtMessageType::kPublishNamespace), _));
-  session_.PublishNamespace(TrackNamespace("foo"),
-                            publish_namespace_resolved_callback.AsStdFunction(),
-                            VersionSpecificParameters());
+  MoqtRequestErrorInfo cancel_error_info;
+  session_.PublishNamespace(
+      TrackNamespace("foo"), MessageParameters(),
+      publish_namespace_response_callback.AsStdFunction(),
+      [&](MoqtRequestErrorInfo info) { cancel_error_info = info; });
 
   MoqtRequestOk ok = {/*request_id=*/0, MessageParameters()};
-  EXPECT_CALL(publish_namespace_resolved_callback, Call(_, _))
-      .WillOnce([&](TrackNamespace track_namespace,
-                    std::optional<MoqtRequestErrorInfo> error) {
-        EXPECT_EQ(track_namespace, TrackNamespace("foo"));
+  EXPECT_CALL(publish_namespace_response_callback, Call)
+      .WillOnce([&](std::optional<MoqtRequestErrorInfo> error) {
         EXPECT_FALSE(error.has_value());
       });
   stream_input->OnRequestOkMessage(ok);
 
   MoqtPublishNamespaceCancel cancel = {
-      TrackNamespace("foo"),
+      /*request_id=*/0,
       RequestErrorCode::kInternalError,
       /*error_reason=*/"Test error",
   };
-  EXPECT_CALL(publish_namespace_resolved_callback, Call(_, _))
-      .WillOnce([&](TrackNamespace track_namespace,
-                    std::optional<MoqtRequestErrorInfo> error) {
-        EXPECT_EQ(track_namespace, TrackNamespace("foo"));
-        ASSERT_TRUE(error.has_value());
-        EXPECT_EQ(error->error_code, RequestErrorCode::kInternalError);
-        EXPECT_EQ(error->reason_phrase, "Test error");
-      });
   stream_input->OnPublishNamespaceCancelMessage(cancel);
+  EXPECT_EQ(cancel_error_info.error_code, RequestErrorCode::kInternalError);
+  EXPECT_EQ(cancel_error_info.reason_phrase, "Test error");
   // State is gone.
   EXPECT_FALSE(session_.PublishNamespaceDone(TrackNamespace("foo")));
 }
 
 TEST_F(MoqtSessionTest, PublishNamespaceWithOkAndPublishNamespaceDone) {
-  testing::MockFunction<void(TrackNamespace track_namespace,
-                             std::optional<MoqtRequestErrorInfo> error_message)>
+  testing::MockFunction<void(std::optional<MoqtRequestErrorInfo> error_message)>
       publish_namespace_resolved_callback;
   std::unique_ptr<MoqtControlParserVisitor> stream_input =
       MoqtSessionPeer::CreateControlStream(&session_, &mock_stream_);
   EXPECT_CALL(
       mock_stream_,
       Writev(ControlMessageOfType(MoqtMessageType::kPublishNamespace), _));
-  session_.PublishNamespace(TrackNamespace{"foo"},
+  session_.PublishNamespace(TrackNamespace{"foo"}, MessageParameters(),
                             publish_namespace_resolved_callback.AsStdFunction(),
-                            VersionSpecificParameters());
+                            [](MoqtRequestErrorInfo) {});
 
   MoqtRequestOk ok = {/*request_id=*/0, MessageParameters()};
-  EXPECT_CALL(publish_namespace_resolved_callback, Call(_, _))
-      .WillOnce([&](TrackNamespace track_namespace,
-                    std::optional<MoqtRequestErrorInfo> error) {
-        EXPECT_EQ(track_namespace, TrackNamespace{"foo"});
+  EXPECT_CALL(publish_namespace_resolved_callback, Call)
+      .WillOnce([&](std::optional<MoqtRequestErrorInfo> error) {
         EXPECT_FALSE(error.has_value());
       });
   stream_input->OnRequestOkMessage(ok);
@@ -503,24 +493,21 @@
 }
 
 TEST_F(MoqtSessionTest, PublishNamespaceWithError) {
-  testing::MockFunction<void(TrackNamespace track_namespace,
-                             std::optional<MoqtRequestErrorInfo> error_message)>
+  testing::MockFunction<void(std::optional<MoqtRequestErrorInfo> error_message)>
       publish_namespace_resolved_callback;
   std::unique_ptr<MoqtControlParserVisitor> stream_input =
       MoqtSessionPeer::CreateControlStream(&session_, &mock_stream_);
   EXPECT_CALL(
       mock_stream_,
       Writev(ControlMessageOfType(MoqtMessageType::kPublishNamespace), _));
-  session_.PublishNamespace(TrackNamespace{"foo"},
+  session_.PublishNamespace(TrackNamespace{"foo"}, MessageParameters(),
                             publish_namespace_resolved_callback.AsStdFunction(),
-                            VersionSpecificParameters());
+                            [](MoqtRequestErrorInfo) {});
 
   MoqtRequestError error{/*request_id=*/0, RequestErrorCode::kInternalError,
                          std::nullopt, "Test error"};
-  EXPECT_CALL(publish_namespace_resolved_callback, Call(_, _))
-      .WillOnce([&](TrackNamespace track_namespace,
-                    std::optional<MoqtRequestErrorInfo> error) {
-        EXPECT_EQ(track_namespace, TrackNamespace{"foo"});
+  EXPECT_CALL(publish_namespace_resolved_callback, Call)
+      .WillOnce([&](std::optional<MoqtRequestErrorInfo> error) {
         ASSERT_TRUE(error.has_value());
         EXPECT_EQ(error->error_code, RequestErrorCode::kInternalError);
         EXPECT_EQ(error->reason_phrase, "Test error");
@@ -954,17 +941,18 @@
   TrackNamespace track_namespace{"foo"};
   std::unique_ptr<MoqtControlParserVisitor> stream_input =
       MoqtSessionPeer::CreateControlStream(&session_, &mock_stream_);
-  auto parameters = std::make_optional<VersionSpecificParameters>(
-      AuthTokenType::kOutOfBand, "foo");
+  MessageParameters parameters;
+  parameters.authorization_tokens.emplace_back(AuthTokenType::kOutOfBand,
+                                               "foo");
   MoqtPublishNamespace publish_namespace = {
       kDefaultPeerRequestId,
       track_namespace,
-      *parameters,
+      parameters,
   };
   EXPECT_CALL(session_callbacks_.incoming_publish_namespace_callback,
-              Call(track_namespace, parameters, _))
+              Call(track_namespace, std::make_optional(parameters), _))
       .WillOnce([](const TrackNamespace&,
-                   const std::optional<VersionSpecificParameters>&,
+                   const std::optional<MessageParameters>&,
                    MoqtResponseCallback callback) {
         std::move(callback)(std::nullopt);
       });
@@ -973,17 +961,15 @@
                          kDefaultPeerRequestId, MessageParameters()}),
                      _));
   stream_input->OnPublishNamespaceMessage(publish_namespace);
-  MoqtPublishNamespaceDone unpublish_namespace = {
-      track_namespace,
+  MoqtPublishNamespaceDone publish_namespace_done = {
+      /*request_id=*/0,
   };
-  EXPECT_CALL(
-      session_callbacks_.incoming_publish_namespace_callback,
-      Call(track_namespace, std::optional<VersionSpecificParameters>(), _))
+  EXPECT_CALL(session_callbacks_.incoming_publish_namespace_callback,
+              Call(track_namespace, std::optional<MessageParameters>(), _))
       .WillOnce(
-          [](const TrackNamespace&,
-             const std::optional<VersionSpecificParameters>&,
+          [](const TrackNamespace&, const std::optional<MessageParameters>&,
              MoqtResponseCallback callback) { EXPECT_EQ(callback, nullptr); });
-  stream_input->OnPublishNamespaceDoneMessage(unpublish_namespace);
+  stream_input->OnPublishNamespaceDoneMessage(publish_namespace_done);
 }
 
 TEST_F(MoqtSessionTest,
@@ -992,17 +978,18 @@
 
   std::unique_ptr<MoqtControlParserVisitor> stream_input =
       MoqtSessionPeer::CreateControlStream(&session_, &mock_stream_);
-  auto parameters = std::make_optional<VersionSpecificParameters>(
-      AuthTokenType::kOutOfBand, "foo");
+  MessageParameters parameters;
+  parameters.authorization_tokens.emplace_back(AuthTokenType::kOutOfBand,
+                                               "foo");
   MoqtPublishNamespace publish_namespace = {
       kDefaultPeerRequestId,
       track_namespace,
-      *parameters,
+      parameters,
   };
   EXPECT_CALL(session_callbacks_.incoming_publish_namespace_callback,
-              Call(track_namespace, parameters, _))
+              Call(track_namespace, std::make_optional(parameters), _))
       .WillOnce([](const TrackNamespace&,
-                   const std::optional<VersionSpecificParameters>&,
+                   const std::optional<MessageParameters>&,
                    MoqtResponseCallback callback) {
         std::move(callback)(std::nullopt);
       });
@@ -1013,10 +1000,10 @@
   stream_input->OnPublishNamespaceMessage(publish_namespace);
   EXPECT_CALL(mock_stream_,
               Writev(SerializedControlMessage(MoqtPublishNamespaceCancel{
-                         track_namespace, RequestErrorCode::kInternalError,
-                         "deadbeef"}),
+                         kDefaultPeerRequestId,
+                         RequestErrorCode::kInternalError, "deadbeef"}),
                      _));
-  session_.CancelPublishNamespace(track_namespace,
+  session_.PublishNamespaceCancel(track_namespace,
                                   RequestErrorCode::kInternalError, "deadbeef");
 }
 
@@ -1025,12 +1012,13 @@
 
   std::unique_ptr<MoqtControlParserVisitor> stream_input =
       MoqtSessionPeer::CreateControlStream(&session_, &mock_stream_);
-  auto parameters = std::make_optional<VersionSpecificParameters>(
-      AuthTokenType::kOutOfBand, "foo");
+  MessageParameters parameters;
+  parameters.authorization_tokens.emplace_back(AuthTokenType::kOutOfBand,
+                                               "foo");
   MoqtPublishNamespace publish_namespace = {
       kDefaultPeerRequestId,
       track_namespace,
-      *parameters,
+      parameters,
   };
   MoqtRequestErrorInfo error = {
       RequestErrorCode::kNotSupported,
@@ -1038,10 +1026,9 @@
       "deadbeef",
   };
   EXPECT_CALL(session_callbacks_.incoming_publish_namespace_callback,
-              Call(track_namespace, parameters, _))
+              Call(track_namespace, std::make_optional(parameters), _))
       .WillOnce(
-          [&](const TrackNamespace&,
-              const std::optional<VersionSpecificParameters>&,
+          [&](const TrackNamespace&, const std::optional<MessageParameters>&,
               MoqtResponseCallback callback) { std::move(callback)(error); });
   EXPECT_CALL(mock_stream_,
               Writev(SerializedControlMessage(MoqtRequestError{
@@ -3529,9 +3516,9 @@
           +[](std::optional<MoqtRequestErrorInfo>) {}),
       nullptr);
   session_.PublishNamespace(
-      TrackNamespace{"foo"},
-      +[](TrackNamespace, std::optional<MoqtRequestErrorInfo>) {},
-      VersionSpecificParameters());
+      TrackNamespace{"foo"}, MessageParameters(),
+      +[](std::optional<MoqtRequestErrorInfo>) {},
+      +[](MoqtRequestErrorInfo) {});
   EXPECT_FALSE(session_.Fetch(
       FullTrackName{TrackNamespace("foo"), "bar"},
       +[](std::unique_ptr<MoqtFetchTask>) {}, Location(0, 0), 5, std::nullopt,
@@ -3562,8 +3549,8 @@
   stream_input->OnSubscribeMessage(DefaultSubscribe());
   EXPECT_CALL(mock_stream_,
               Writev(ControlMessageOfType(MoqtMessageType::kRequestError), _));
-  stream_input->OnPublishNamespaceMessage(MoqtPublishNamespace(
-      3, TrackNamespace("foo"), VersionSpecificParameters()));
+  stream_input->OnPublishNamespaceMessage(
+      MoqtPublishNamespace(3, TrackNamespace("foo"), MessageParameters()));
   EXPECT_CALL(mock_stream_,
               Writev(ControlMessageOfType(MoqtMessageType::kRequestError), _));
   MoqtFetch fetch = DefaultFetch();
@@ -3597,9 +3584,9 @@
           +[](std::optional<MoqtRequestErrorInfo>) {}),
       nullptr);
   session_.PublishNamespace(
-      TrackNamespace{"foo"},
-      +[](TrackNamespace, std::optional<MoqtRequestErrorInfo>) {},
-      VersionSpecificParameters());
+      TrackNamespace{"foo"}, MessageParameters(),
+      +[](std::optional<MoqtRequestErrorInfo>) {},
+      +[](MoqtRequestErrorInfo) {});
   EXPECT_FALSE(session_.Fetch(
       FullTrackName(TrackNamespace("foo"), "bar"),
       +[](std::unique_ptr<MoqtFetchTask>) {}, Location(0, 0), 5, std::nullopt,
@@ -4109,11 +4096,11 @@
       MoqtSessionPeer::CreateControlStream(&session_, &control_stream);
   // Register two incoming PUBLISH_NAMESPACE.
   MoqtPublishNamespace publish_namespace{
-      /*request_id=*/1, TrackNamespace{"foo"}, VersionSpecificParameters()};
+      /*request_id=*/1, TrackNamespace{"foo"}, MessageParameters()};
   EXPECT_CALL(session_callbacks_.incoming_publish_namespace_callback,
               Call(TrackNamespace{"foo"}, _, _))
       .WillOnce([&](const TrackNamespace&,
-                    const std::optional<VersionSpecificParameters>&,
+                    const std::optional<MessageParameters>&,
                     MoqtResponseCallback callback) {
         std::move(callback)(std::nullopt);
       });
@@ -4122,11 +4109,11 @@
   stream_input->OnPublishNamespaceMessage(publish_namespace);
 
   publish_namespace = MoqtPublishNamespace(
-      /*request_id=*/3, TrackNamespace{"bar"}, VersionSpecificParameters());
+      /*request_id=*/3, TrackNamespace{"bar"}, MessageParameters());
   EXPECT_CALL(session_callbacks_.incoming_publish_namespace_callback,
               Call(TrackNamespace{"bar"}, _, _))
       .WillOnce([&](const TrackNamespace&,
-                    const std::optional<VersionSpecificParameters>&,
+                    const std::optional<MessageParameters>&,
                     MoqtResponseCallback callback) {
         std::move(callback)(std::nullopt);
       });
@@ -4135,23 +4122,21 @@
   stream_input->OnPublishNamespaceMessage(publish_namespace);
 
   // Revoke "bar"
-  MoqtPublishNamespaceDone done{TrackNamespace{"bar"}};
-  EXPECT_CALL(session_callbacks_.incoming_publish_namespace_callback,
-              Call(TrackNamespace{"bar"},
-                   std::optional<VersionSpecificParameters>(), _))
+  MoqtPublishNamespaceDone done{/*request_id=*/3};
+  EXPECT_CALL(
+      session_callbacks_.incoming_publish_namespace_callback,
+      Call(TrackNamespace{"bar"}, std::optional<MessageParameters>(), _))
       .WillOnce(
-          [](const TrackNamespace&,
-             const std::optional<VersionSpecificParameters>&,
+          [](const TrackNamespace&, const std::optional<MessageParameters>&,
              MoqtResponseCallback callback) { EXPECT_EQ(callback, nullptr); });
   stream_input->OnPublishNamespaceDoneMessage(done);
 
   // Destroying the session should revoke "foo".
-  EXPECT_CALL(session_callbacks_.incoming_publish_namespace_callback,
-              Call(TrackNamespace{"foo"},
-                   std::optional<VersionSpecificParameters>(), _))
+  EXPECT_CALL(
+      session_callbacks_.incoming_publish_namespace_callback,
+      Call(TrackNamespace{"foo"}, std::optional<MessageParameters>(), _))
       .WillOnce(
-          [](const TrackNamespace&,
-             const std::optional<VersionSpecificParameters>&,
+          [](const TrackNamespace&, const std::optional<MessageParameters>&,
              MoqtResponseCallback callback) { EXPECT_EQ(callback, nullptr); });
   // Test teardown will destroy session_, triggering removal of "foo".
 }
diff --git a/quiche/quic/moqt/test_tools/mock_moqt_session.h b/quiche/quic/moqt/test_tools/mock_moqt_session.h
index a106fa7..48c0553 100644
--- a/quiche/quic/moqt/test_tools/mock_moqt_session.h
+++ b/quiche/quic/moqt/test_tools/mock_moqt_session.h
@@ -57,12 +57,23 @@
                std::optional<MoqtDeliveryOrder> delivery_order,
                VersionSpecificParameters parameters),
               (override));
-  MOCK_METHOD(void, PublishNamespace,
-              (TrackNamespace track_namespace,
-               MoqtOutgoingPublishNamespaceCallback callback,
-               VersionSpecificParameters parameters),
+  MOCK_METHOD(
+      bool, PublishNamespace,
+      (const TrackNamespace& track_namespace,
+       const MessageParameters& parameters,
+       MoqtResponseCallback response_callback,
+       quiche::SingleUseCallback<void(MoqtRequestErrorInfo)> cancel_callback),
+      (override));
+  MOCK_METHOD(bool, PublishNamespaceUpdate,
+              (const TrackNamespace& track_namespace,
+               MessageParameters& parameters,
+               MoqtResponseCallback response_callback),
               (override));
-  MOCK_METHOD(bool, PublishNamespaceDone, (TrackNamespace track_namespace),
+  MOCK_METHOD(bool, PublishNamespaceDone,
+              (const TrackNamespace& track_namespace), (override));
+  MOCK_METHOD(bool, PublishNamespaceCancel,
+              (const TrackNamespace& track_namespace,
+               RequestErrorCode error_code, absl::string_view error_reason),
               (override));
   MOCK_METHOD(std::unique_ptr<MoqtNamespaceTask>, SubscribeNamespace,
               (TrackNamespace&, SubscribeNamespaceOption,
diff --git a/quiche/quic/moqt/test_tools/moqt_mock_visitor.h b/quiche/quic/moqt/test_tools/moqt_mock_visitor.h
index 74dcf57..b9dc508 100644
--- a/quiche/quic/moqt/test_tools/moqt_mock_visitor.h
+++ b/quiche/quic/moqt/test_tools/moqt_mock_visitor.h
@@ -41,7 +41,7 @@
   testing::MockFunction<void(absl::string_view)> session_terminated_callback;
   testing::MockFunction<void()> session_deleted_callback;
   testing::MockFunction<void(const TrackNamespace&,
-                             std::optional<VersionSpecificParameters>,
+                             const std::optional<MessageParameters>&,
                              MoqtResponseCallback)>
       incoming_publish_namespace_callback;
   testing::MockFunction<std::unique_ptr<MoqtNamespaceTask>(
diff --git a/quiche/quic/moqt/test_tools/moqt_test_message.h b/quiche/quic/moqt/test_tools/moqt_test_message.h
index 947be1b..0ebf5fa 100644
--- a/quiche/quic/moqt/test_tools/moqt_test_message.h
+++ b/quiche/quic/moqt/test_tools/moqt_test_message.h
@@ -19,6 +19,7 @@
 #include "quiche/quic/core/quic_data_reader.h"
 #include "quiche/quic/core/quic_data_writer.h"
 #include "quiche/quic/core/quic_time.h"
+#include "quiche/quic/moqt/moqt_error.h"
 #include "quiche/quic/moqt/moqt_key_value_pair.h"
 #include "quiche/quic/moqt/moqt_messages.h"
 #include "quiche/quic/moqt/moqt_names.h"
@@ -925,6 +926,8 @@
  public:
   PublishNamespaceMessage() : TestMessageBase() {
     SetWireImage(raw_packet_, sizeof(raw_packet_));
+    publish_namespace_.parameters.authorization_tokens.push_back(
+        AuthToken(AuthTokenType::kOutOfBand, "bar"));
   }
 
   bool EqualFieldValues(MessageStructuredData& values) const override {
@@ -961,7 +964,7 @@
   MoqtPublishNamespace publish_namespace_ = {
       /*request_id=*/2,
       TrackNamespace{"foo"},
-      VersionSpecificParameters(AuthTokenType::kOutOfBand, "bar"),
+      MessageParameters(),
   };
 };
 
@@ -1076,26 +1079,29 @@
 
   bool EqualFieldValues(MessageStructuredData& values) const override {
     auto cast = std::get<MoqtPublishNamespaceDone>(values);
-    if (cast.track_namespace != publish_namespace_done_.track_namespace) {
-      QUIC_LOG(INFO) << "PUBLISH_NAMESPACE_DONE track namespace mismatch";
+    if (cast.request_id != publish_namespace_done_.request_id) {
+      QUIC_LOG(INFO) << "PUBLISH_NAMESPACE_DONE request ID mismatch";
       return false;
     }
     return true;
   }
 
-  void ExpandVarints() override { ExpandVarintsImpl("vv---"); }
+  void ExpandVarints() override { ExpandVarintsImpl("v"); }
 
   MessageStructuredData structured_data() const override {
     return TestMessageBase::MessageStructuredData(publish_namespace_done_);
   }
 
  private:
-  uint8_t raw_packet_[8] = {
-      0x09, 0x00, 0x05, 0x01, 0x03, 0x66, 0x6f, 0x6f,  // track_namespace
+  uint8_t raw_packet_[4] = {
+      0x09,
+      0x00,
+      0x01,
+      0x01,  // request_id = 1
   };
 
   MoqtPublishNamespaceDone publish_namespace_done_ = {
-      TrackNamespace("foo"),
+      /*request_id=*/1,
   };
 };
 
@@ -1107,8 +1113,8 @@
 
   bool EqualFieldValues(MessageStructuredData& values) const override {
     auto cast = std::get<MoqtPublishNamespaceCancel>(values);
-    if (cast.track_namespace != publish_namespace_cancel_.track_namespace) {
-      QUIC_LOG(INFO) << "PUBLISH_NAMESPACE CANCEL track namespace mismatch";
+    if (cast.request_id != publish_namespace_cancel_.request_id) {
+      QUIC_LOG(INFO) << "PUBLISH_NAMESPACE CANCEL request ID mismatch";
       return false;
     }
     if (cast.error_code != publish_namespace_cancel_.error_code) {
@@ -1122,22 +1128,21 @@
     return true;
   }
 
-  void ExpandVarints() override { ExpandVarintsImpl("vv---vv---"); }
+  void ExpandVarints() override { ExpandVarintsImpl("vvv---"); }
 
   MessageStructuredData structured_data() const override {
     return TestMessageBase::MessageStructuredData(publish_namespace_cancel_);
   }
 
  private:
-  uint8_t raw_packet_[13] = {
-      0x0c, 0x00, 0x0a, 0x01,
-      0x03, 0x66, 0x6f, 0x6f,  // track_namespace = "foo"
+  uint8_t raw_packet_[9] = {
+      0x0c, 0x00, 0x06, 0x02,  // request_id = 2
       0x03,                    // error_code = 3
       0x03, 0x62, 0x61, 0x72,  // error_reason = "bar"
   };
 
   MoqtPublishNamespaceCancel publish_namespace_cancel_ = {
-      TrackNamespace("foo"),
+      /*request_id=*/2,
       RequestErrorCode::kNotSupported,
       /*error_reason=*/"bar",
   };
diff --git a/quiche/quic/moqt/tools/chat_client.cc b/quiche/quic/moqt/tools/chat_client.cc
index 0baf539..a82406c 100644
--- a/quiche/quic/moqt/tools/chat_client.cc
+++ b/quiche/quic/moqt/tools/chat_client.cc
@@ -49,7 +49,7 @@
 
 void ChatClient::OnIncomingPublishNamespace(
     const moqt::TrackNamespace& track_namespace,
-    std::optional<VersionSpecificParameters> parameters,
+    const std::optional<MessageParameters>& parameters,
     moqt::MoqtResponseCallback absl_nullable callback) {
   if (!session_is_open_) {
     return;
@@ -261,9 +261,8 @@
   queue_ = std::make_shared<MoqtOutgoingQueue>(my_track_name_);
   publisher_.Add(queue_);
   session_->set_publisher(&publisher_);
-  MoqtOutgoingPublishNamespaceCallback publish_namespace_callback =
-      [this](TrackNamespace track_namespace,
-             std::optional<MoqtRequestErrorInfo> reason) {
+  MoqtResponseCallback publish_namespace_callback =
+      [this](std::optional<MoqtRequestErrorInfo> reason) {
         if (reason.has_value()) {
           std::cout << "PUBLISH_NAMESPACE rejected, " << reason->reason_phrase
                     << "\n";
@@ -271,15 +270,27 @@
                           "Local PUBLISH_NAMESPACE rejected");
           return;
         }
-        std::cout << "PUBLISH_NAMESPACE for " << track_namespace.ToString()
-                  << " accepted\n";
+        std::cout << "PUBLISH_NAMESPACE accepted\n";
         return;
       };
   std::cout << "Announcing " << GetUserNamespace(my_track_name_).ToString()
             << "\n";
-  session_->PublishNamespace(GetUserNamespace(my_track_name_),
-                             std::move(publish_namespace_callback),
-                             VersionSpecificParameters());
+  session_->PublishNamespace(
+      GetUserNamespace(my_track_name_), MessageParameters(),
+      [this](std::optional<MoqtRequestErrorInfo> reason) {
+        if (reason.has_value()) {
+          std::cout << "PUBLISH_NAMESPACE rejected, " << reason->reason_phrase
+                    << "\n";
+          session_->Error(MoqtError::kInternalError,
+                          "Local PUBLISH_NAMESPACE rejected");
+          return;
+        }
+        std::cout << "PUBLISH_NAMESPACE for "
+                  << GetUserNamespace(my_track_name_).ToString()
+                  << " accepted\n";
+        return;
+      },
+      [](MoqtRequestErrorInfo) {});
 
   // Send SUBSCRIBE_NAMESPACE. Pop 3 levels of namespace to get to
   // {moq-chat, chat-id}
@@ -331,7 +342,7 @@
                 OnIncomingPublishNamespace(
                     *track_namespace,
                     (type == TransactionType::kAdd)
-                        ? std::make_optional(VersionSpecificParameters())
+                        ? std::make_optional(MessageParameters())
                         : std::nullopt,
                     /*callback=*/nullptr);
                 break;
diff --git a/quiche/quic/moqt/tools/chat_client.h b/quiche/quic/moqt/tools/chat_client.h
index a042e8d..516ea07 100644
--- a/quiche/quic/moqt/tools/chat_client.h
+++ b/quiche/quic/moqt/tools/chat_client.h
@@ -141,7 +141,7 @@
   // a PUBLISH_NAMESPACE.
   void OnIncomingPublishNamespace(
       const moqt::TrackNamespace& track_namespace,
-      std::optional<VersionSpecificParameters> parameters,
+      const std::optional<MessageParameters>& parameters,
       moqt::MoqtResponseCallback absl_nullable callback);
 
   // Basic session information
diff --git a/quiche/quic/moqt/tools/moqt_ingestion_server_bin.cc b/quiche/quic/moqt/tools/moqt_ingestion_server_bin.cc
index c3de814..80330b7 100644
--- a/quiche/quic/moqt/tools/moqt_ingestion_server_bin.cc
+++ b/quiche/quic/moqt/tools/moqt_ingestion_server_bin.cc
@@ -30,7 +30,10 @@
 #include "absl/time/clock.h"
 #include "absl/time/time.h"
 #include "quiche/quic/moqt/moqt_error.h"
+#include "quiche/quic/moqt/moqt_fetch_task.h"
+#include "quiche/quic/moqt/moqt_key_value_pair.h"
 #include "quiche/quic/moqt/moqt_messages.h"
+#include "quiche/quic/moqt/moqt_names.h"
 #include "quiche/quic/moqt/moqt_object.h"
 #include "quiche/quic/moqt/moqt_session.h"
 #include "quiche/quic/moqt/moqt_session_callbacks.h"
@@ -121,7 +124,7 @@
   // TODO(martinduke): Handle when |publish_namespace| is false
   // (PUBLISH_NAMESPACE_DONE).
   void OnPublishNamespaceReceived(TrackNamespace track_namespace,
-                                  std::optional<VersionSpecificParameters>,
+                                  std::optional<MessageParameters>,
                                   MoqtResponseCallback callback) {
     if (!IsValidTrackNamespace(track_namespace) &&
         !quiche::GetQuicheCommandLineFlag(
diff --git a/quiche/quic/moqt/tools/moqt_relay.cc b/quiche/quic/moqt/tools/moqt_relay.cc
index cc7dd54..74e35fa 100644
--- a/quiche/quic/moqt/tools/moqt_relay.cc
+++ b/quiche/quic/moqt/tools/moqt_relay.cc
@@ -110,10 +110,9 @@
 
 void MoqtRelay::SetNamespaceCallbacks(MoqtSessionInterface* session) {
   session->callbacks().incoming_publish_namespace_callback =
-      [this, session](
-          const TrackNamespace& track_namespace,
-          const std::optional<VersionSpecificParameters>& parameters,
-          MoqtResponseCallback callback) {
+      [this, session](const TrackNamespace& track_namespace,
+                      const std::optional<MessageParameters>& parameters,
+                      MoqtResponseCallback callback) {
         if (is_closing_) {
           return;
         }
diff --git a/quiche/quic/moqt/tools/moqt_relay_test.cc b/quiche/quic/moqt/tools/moqt_relay_test.cc
index 8aa2581..1f677bc 100644
--- a/quiche/quic/moqt/tools/moqt_relay_test.cc
+++ b/quiche/quic/moqt/tools/moqt_relay_test.cc
@@ -134,9 +134,8 @@
             nullptr);
   // relay_ publishes a namespace, so upstream_ will route to relay_.
   relay_.client_session()->PublishNamespace(
-      TrackNamespace({"foo"}),
-      [](TrackNamespace, std::optional<MoqtRequestErrorInfo>) {},
-      VersionSpecificParameters());
+      TrackNamespace({"foo"}), MessageParameters(),
+      [](std::optional<MoqtRequestErrorInfo>) {}, [](MoqtRequestErrorInfo) {});
   upstream_.RunOneEvent();
   // There is now an upstream session for "Foo".
   std::shared_ptr<MoqtTrackPublisher> track =
@@ -192,8 +191,8 @@
   // Downstream publishes a namespace. It's stored in relay_ but upstream_
   // hasn't been notified.
   downstream_.client_session()->PublishNamespace(
-      foobar, [](TrackNamespace, std::optional<MoqtRequestErrorInfo>) {},
-      VersionSpecificParameters());
+      foobar, MessageParameters(), [](std::optional<MoqtRequestErrorInfo>) {},
+      [](MoqtRequestErrorInfo) {});
   relay_.RunOneEvent();
   upstream_.RunOneEvent();
   EXPECT_THAT(relay_published_namespaces, ElementsAre(foobar));
@@ -209,7 +208,7 @@
     while (task->GetNextSuffix(suffix, type) == kSuccess) {
       if (type == TransactionType::kAdd) {
         upstream_.publisher()->OnPublishNamespace(
-            *task->prefix().AddSuffix(suffix), VersionSpecificParameters(),
+            *task->prefix().AddSuffix(suffix), MessageParameters(),
             upstream_session, nullptr);
       } else {
         upstream_.publisher()->OnPublishNamespaceDone(
@@ -223,8 +222,8 @@
 
   // Downstream publishes another namespace. Everyone is notified.
   downstream_.client_session()->PublishNamespace(
-      foobaz, [](TrackNamespace, std::optional<MoqtRequestErrorInfo>) {},
-      VersionSpecificParameters());
+      foobaz, MessageParameters(), [](std::optional<MoqtRequestErrorInfo>) {},
+      [](MoqtRequestErrorInfo) {});
   relay_.RunOneEvent();
   upstream_.RunOneEvent();
   EXPECT_THAT(relay_published_namespaces, ElementsAre(foobar, foobaz));