diff --git a/eng/versioning/version_client.txt b/eng/versioning/version_client.txt
index 5b42f8e3ac3a..bf3698c3d5bd 100644
--- a/eng/versioning/version_client.txt
+++ b/eng/versioning/version_client.txt
@@ -70,7 +70,7 @@ com.azure:azure-analytics-synapse-monitoring;1.0.0-beta.4;1.0.0-beta.5
 com.azure:azure-code-customization-parent;1.0.0-beta.1;1.0.0-beta.1
 com.azure:azure-communication-callautomation;1.3.3;1.5.0-beta.1
 com.azure:azure-communication-callingserver;1.0.0-beta.4;1.0.0-beta.5
-com.azure:azure-communication-chat;1.5.9;1.6.0
+com.azure:azure-communication-chat;1.6.0;1.6.1
 com.azure:azure-communication-common;1.4.0;1.5.0-beta.1
 com.azure:azure-communication-common-perf;1.0.0-beta.1;1.0.0-beta.1
 com.azure:azure-communication-email;1.0.21;1.1.0-beta.2
diff --git a/sdk/communication/azure-communication-chat/CHANGELOG.md b/sdk/communication/azure-communication-chat/CHANGELOG.md
index 139021ef7cd8..25eed08cd25e 100644
--- a/sdk/communication/azure-communication-chat/CHANGELOG.md
+++ b/sdk/communication/azure-communication-chat/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Release History
 
+## 1.6.1 (2025-08-05)
+
+### Other Changes
+- Added support for a new communication identifier `TeamsExtensionUserIdentifierModel`.
+- Added properties for communication identifier 'PhoneNumberIdentifierModel'.
+
 ## 1.6.0 (2025-06-18)
 
 ### Features Added
diff --git a/sdk/communication/azure-communication-chat/README.md b/sdk/communication/azure-communication-chat/README.md
index d721a077d917..50ec24f4e54b 100644
--- a/sdk/communication/azure-communication-chat/README.md
+++ b/sdk/communication/azure-communication-chat/README.md
@@ -52,7 +52,7 @@ add the direct dependency to your project as follows.
 <dependency>
     <groupId>com.azure</groupId>
     <artifactId>azure-communication-chat</artifactId>
-    <version>1.6.0</version>
+    <version>1.6.1</version>
 </dependency>
 ```
 
diff --git a/sdk/communication/azure-communication-chat/pom.xml b/sdk/communication/azure-communication-chat/pom.xml
index e095a3352b4b..fec4f48a02cf 100644
--- a/sdk/communication/azure-communication-chat/pom.xml
+++ b/sdk/communication/azure-communication-chat/pom.xml
@@ -14,7 +14,7 @@
 
   <groupId>com.azure</groupId>
   <artifactId>azure-communication-chat</artifactId>
-  <version>1.6.0</version> <!-- {x-version-update;com.azure:azure-communication-chat;current} -->
+  <version>1.6.1</version> <!-- {x-version-update;com.azure:azure-communication-chat;current} -->
 
   <name>Microsoft Azure client library for chat application</name>
   <description>
diff --git a/sdk/communication/azure-communication-chat/src/main/java/com/azure/communication/chat/implementation/models/CommunicationIdentifierModel.java b/sdk/communication/azure-communication-chat/src/main/java/com/azure/communication/chat/implementation/models/CommunicationIdentifierModel.java
index 3aec73a3ac4d..30b7c049d367 100644
--- a/sdk/communication/azure-communication-chat/src/main/java/com/azure/communication/chat/implementation/models/CommunicationIdentifierModel.java
+++ b/sdk/communication/azure-communication-chat/src/main/java/com/azure/communication/chat/implementation/models/CommunicationIdentifierModel.java
@@ -48,6 +48,11 @@ public final class CommunicationIdentifierModel implements JsonSerializable<Comm
      */
     private MicrosoftTeamsAppIdentifierModel microsoftTeamsApp;
 
+    /*
+     * The Microsoft Teams Extension user.
+     */
+    private TeamsExtensionUserIdentifierModel teamsExtensionUser;
+
     /**
      * Creates an instance of CommunicationIdentifierModel class.
      */
@@ -174,6 +179,26 @@ public CommunicationIdentifierModel setMicrosoftTeamsApp(MicrosoftTeamsAppIdenti
         return this;
     }
 
+    /**
+     * Get the teamsExtensionUser property: The Microsoft Teams Extension user.
+     * 
+     * @return the teamsExtensionUser value.
+     */
+    public TeamsExtensionUserIdentifierModel getTeamsExtensionUser() {
+        return this.teamsExtensionUser;
+    }
+
+    /**
+     * Set the teamsExtensionUser property: The Microsoft Teams Extension user.
+     * 
+     * @param teamsExtensionUser the teamsExtensionUser value to set.
+     * @return the CommunicationIdentifierModel object itself.
+     */
+    public CommunicationIdentifierModel setTeamsExtensionUser(TeamsExtensionUserIdentifierModel teamsExtensionUser) {
+        this.teamsExtensionUser = teamsExtensionUser;
+        return this;
+    }
+
     /**
      * {@inheritDoc}
      */
@@ -186,6 +211,7 @@ public JsonWriter toJson(JsonWriter jsonWriter) throws IOException {
         jsonWriter.writeJsonField("phoneNumber", this.phoneNumber);
         jsonWriter.writeJsonField("microsoftTeamsUser", this.microsoftTeamsUser);
         jsonWriter.writeJsonField("microsoftTeamsApp", this.microsoftTeamsApp);
+        jsonWriter.writeJsonField("teamsExtensionUser", this.teamsExtensionUser);
         return jsonWriter.writeEndObject();
     }
 
@@ -220,6 +246,9 @@ public static CommunicationIdentifierModel fromJson(JsonReader jsonReader) throw
                 } else if ("microsoftTeamsApp".equals(fieldName)) {
                     deserializedCommunicationIdentifierModel.microsoftTeamsApp
                         = MicrosoftTeamsAppIdentifierModel.fromJson(reader);
+                } else if ("teamsExtensionUser".equals(fieldName)) {
+                    deserializedCommunicationIdentifierModel.teamsExtensionUser
+                        = TeamsExtensionUserIdentifierModel.fromJson(reader);
                 } else {
                     reader.skipChildren();
                 }
diff --git a/sdk/communication/azure-communication-chat/src/main/java/com/azure/communication/chat/implementation/models/CommunicationIdentifierModelKind.java b/sdk/communication/azure-communication-chat/src/main/java/com/azure/communication/chat/implementation/models/CommunicationIdentifierModelKind.java
index 05bf437af4e0..a3e831a3d65a 100644
--- a/sdk/communication/azure-communication-chat/src/main/java/com/azure/communication/chat/implementation/models/CommunicationIdentifierModelKind.java
+++ b/sdk/communication/azure-communication-chat/src/main/java/com/azure/communication/chat/implementation/models/CommunicationIdentifierModelKind.java
@@ -36,6 +36,11 @@ public final class CommunicationIdentifierModelKind extends ExpandableStringEnum
      */
     public static final CommunicationIdentifierModelKind MICROSOFT_TEAMS_APP = fromString("microsoftTeamsApp");
 
+    /**
+     * Static value teamsExtensionUser for CommunicationIdentifierModelKind.
+     */
+    public static final CommunicationIdentifierModelKind TEAMS_EXTENSION_USER = fromString("teamsExtensionUser");
+
     /**
      * Creates a new instance of CommunicationIdentifierModelKind value.
      * 
diff --git a/sdk/communication/azure-communication-chat/src/main/java/com/azure/communication/chat/implementation/models/CreateChatThreadOptions.java b/sdk/communication/azure-communication-chat/src/main/java/com/azure/communication/chat/implementation/models/CreateChatThreadOptions.java
index 1bf259a3a1c5..4529dd7f3763 100644
--- a/sdk/communication/azure-communication-chat/src/main/java/com/azure/communication/chat/implementation/models/CreateChatThreadOptions.java
+++ b/sdk/communication/azure-communication-chat/src/main/java/com/azure/communication/chat/implementation/models/CreateChatThreadOptions.java
@@ -48,7 +48,7 @@ public CreateChatThreadOptions() {
     /**
      * Get the topic property: The chat thread topic.
      * 
-     * @return the topic.
+     * @return the topic value.
      */
     public String getTopic() {
         return this.topic;
@@ -68,7 +68,7 @@ public CreateChatThreadOptions setTopic(String topic) {
     /**
      * Get the participants property: Participants to be added to the chat thread.
      * 
-     * @return the participants.
+     * @return the participants value.
      */
     public List<ChatParticipant> getParticipants() {
         return this.participants;
@@ -77,7 +77,7 @@ public List<ChatParticipant> getParticipants() {
     /**
      * Set the participants property: Participants to be added to the chat thread.
      * 
-     * @param participants the participants to set.
+     * @param participants the participants value to set.
      * @return the CreateChatThreadOptions object itself.
      */
     public CreateChatThreadOptions setParticipants(List<ChatParticipant> participants) {
@@ -89,7 +89,7 @@ public CreateChatThreadOptions setParticipants(List<ChatParticipant> participant
      * Get the metadata property: Contextual metadata for the thread. The metadata consists of name/value pairs. The
      * total size of all metadata pairs can be up to 1KB in size.
      * 
-     * @return the metadata.
+     * @return the metadata value.
      */
     public Map<String, String> getMetadata() {
         return this.metadata;
@@ -110,7 +110,7 @@ public CreateChatThreadOptions setMetadata(Map<String, String> metadata) {
     /**
      * Get the retentionPolicy property: Data retention policy for auto deletion.
      * 
-     * @return the retentionPolicy.
+     * @return the retentionPolicy value.
      */
     public ChatRetentionPolicy getRetentionPolicy() {
         return this.retentionPolicy;
@@ -135,9 +135,7 @@ public JsonWriter toJson(JsonWriter jsonWriter) throws IOException {
         jsonWriter.writeStartObject();
         jsonWriter.writeStringField("topic", this.topic);
         jsonWriter.writeArrayField("participants", this.participants, (writer, element) -> writer.writeJson(element));
-        if (this.metadata != null) {
-            jsonWriter.writeMapField("metadata", this.metadata, (writer, element) -> writer.writeString(element));
-        }
+        jsonWriter.writeMapField("metadata", this.metadata, (writer, element) -> writer.writeString(element));
         jsonWriter.writeJsonField("retentionPolicy", this.retentionPolicy);
         return jsonWriter.writeEndObject();
     }
diff --git a/sdk/communication/azure-communication-chat/src/main/java/com/azure/communication/chat/implementation/models/MicrosoftTeamsUserIdentifierModel.java b/sdk/communication/azure-communication-chat/src/main/java/com/azure/communication/chat/implementation/models/MicrosoftTeamsUserIdentifierModel.java
index 56b631614cb0..52cf097db84a 100644
--- a/sdk/communication/azure-communication-chat/src/main/java/com/azure/communication/chat/implementation/models/MicrosoftTeamsUserIdentifierModel.java
+++ b/sdk/communication/azure-communication-chat/src/main/java/com/azure/communication/chat/implementation/models/MicrosoftTeamsUserIdentifierModel.java
@@ -17,7 +17,7 @@
 @Fluent
 public final class MicrosoftTeamsUserIdentifierModel implements JsonSerializable<MicrosoftTeamsUserIdentifierModel> {
     /*
-     * The Id of the Microsoft Teams user. If not anonymous, this is the AAD object Id of the user.
+     * The Id of the Microsoft Teams user. If not anonymous, this is the Entra ID object Id of the user.
      */
     private String userId;
 
@@ -38,8 +38,8 @@ public MicrosoftTeamsUserIdentifierModel() {
     }
 
     /**
-     * Get the userId property: The Id of the Microsoft Teams user. If not anonymous, this is the AAD object Id of the
-     * user.
+     * Get the userId property: The Id of the Microsoft Teams user. If not anonymous, this is the Entra ID object Id of
+     * the user.
      * 
      * @return the userId value.
      */
@@ -48,8 +48,8 @@ public String getUserId() {
     }
 
     /**
-     * Set the userId property: The Id of the Microsoft Teams user. If not anonymous, this is the AAD object Id of the
-     * user.
+     * Set the userId property: The Id of the Microsoft Teams user. If not anonymous, this is the Entra ID object Id of
+     * the user.
      * 
      * @param userId the userId value to set.
      * @return the MicrosoftTeamsUserIdentifierModel object itself.
diff --git a/sdk/communication/azure-communication-chat/src/main/java/com/azure/communication/chat/implementation/models/PhoneNumberIdentifierModel.java b/sdk/communication/azure-communication-chat/src/main/java/com/azure/communication/chat/implementation/models/PhoneNumberIdentifierModel.java
index 4a0cdd678a46..464d91b17cc4 100644
--- a/sdk/communication/azure-communication-chat/src/main/java/com/azure/communication/chat/implementation/models/PhoneNumberIdentifierModel.java
+++ b/sdk/communication/azure-communication-chat/src/main/java/com/azure/communication/chat/implementation/models/PhoneNumberIdentifierModel.java
@@ -17,10 +17,22 @@
 @Fluent
 public final class PhoneNumberIdentifierModel implements JsonSerializable<PhoneNumberIdentifierModel> {
     /*
-     * The phone number in E.164 format.
+     * The phone number, usually in E.164 format.
      */
     private String value;
 
+    /*
+     * True if the phone number is anonymous. By default false if missing. If the phone number is anonymous, the value
+     * will be the string 'anonymous'.
+     */
+    private Boolean isAnonymous;
+
+    /*
+     * The asserted Id of the phone number. An asserted Id gets generated when the same phone number joins the same call
+     * more than once.
+     */
+    private String assertedId;
+
     /**
      * Creates an instance of PhoneNumberIdentifierModel class.
      */
@@ -28,7 +40,7 @@ public PhoneNumberIdentifierModel() {
     }
 
     /**
-     * Get the value property: The phone number in E.164 format.
+     * Get the value property: The phone number, usually in E.164 format.
      * 
      * @return the value value.
      */
@@ -37,7 +49,7 @@ public String getValue() {
     }
 
     /**
-     * Set the value property: The phone number in E.164 format.
+     * Set the value property: The phone number, usually in E.164 format.
      * 
      * @param value the value value to set.
      * @return the PhoneNumberIdentifierModel object itself.
@@ -47,6 +59,50 @@ public PhoneNumberIdentifierModel setValue(String value) {
         return this;
     }
 
+    /**
+     * Get the isAnonymous property: True if the phone number is anonymous. By default false if missing. If the phone
+     * number is anonymous, the value will be the string 'anonymous'.
+     * 
+     * @return the isAnonymous value.
+     */
+    public Boolean isAnonymous() {
+        return this.isAnonymous;
+    }
+
+    /**
+     * Set the isAnonymous property: True if the phone number is anonymous. By default false if missing. If the phone
+     * number is anonymous, the value will be the string 'anonymous'.
+     * 
+     * @param isAnonymous the isAnonymous value to set.
+     * @return the PhoneNumberIdentifierModel object itself.
+     */
+    public PhoneNumberIdentifierModel setIsAnonymous(Boolean isAnonymous) {
+        this.isAnonymous = isAnonymous;
+        return this;
+    }
+
+    /**
+     * Get the assertedId property: The asserted Id of the phone number. An asserted Id gets generated when the same
+     * phone number joins the same call more than once.
+     * 
+     * @return the assertedId value.
+     */
+    public String getAssertedId() {
+        return this.assertedId;
+    }
+
+    /**
+     * Set the assertedId property: The asserted Id of the phone number. An asserted Id gets generated when the same
+     * phone number joins the same call more than once.
+     * 
+     * @param assertedId the assertedId value to set.
+     * @return the PhoneNumberIdentifierModel object itself.
+     */
+    public PhoneNumberIdentifierModel setAssertedId(String assertedId) {
+        this.assertedId = assertedId;
+        return this;
+    }
+
     /**
      * {@inheritDoc}
      */
@@ -54,6 +110,8 @@ public PhoneNumberIdentifierModel setValue(String value) {
     public JsonWriter toJson(JsonWriter jsonWriter) throws IOException {
         jsonWriter.writeStartObject();
         jsonWriter.writeStringField("value", this.value);
+        jsonWriter.writeBooleanField("isAnonymous", this.isAnonymous);
+        jsonWriter.writeStringField("assertedId", this.assertedId);
         return jsonWriter.writeEndObject();
     }
 
@@ -75,6 +133,10 @@ public static PhoneNumberIdentifierModel fromJson(JsonReader jsonReader) throws
 
                 if ("value".equals(fieldName)) {
                     deserializedPhoneNumberIdentifierModel.value = reader.getString();
+                } else if ("isAnonymous".equals(fieldName)) {
+                    deserializedPhoneNumberIdentifierModel.isAnonymous = reader.getNullable(JsonReader::getBoolean);
+                } else if ("assertedId".equals(fieldName)) {
+                    deserializedPhoneNumberIdentifierModel.assertedId = reader.getString();
                 } else {
                     reader.skipChildren();
                 }
diff --git a/sdk/communication/azure-communication-chat/swagger/README.md b/sdk/communication/azure-communication-chat/swagger/README.md
index 6facb6013f8f..535734820895 100644
--- a/sdk/communication/azure-communication-chat/swagger/README.md
+++ b/sdk/communication/azure-communication-chat/swagger/README.md
@@ -38,7 +38,7 @@ To update generated files for chat service, run the following command
 tag: package-chat-2025-03-15
 use: '@autorest/java@4.1.33'
 require:
-    - https://raw.githubusercontent.com/Azure/azure-rest-api-specs/b97334ac101d4a5e6556e4d67d1bcdd46fc12139/specification/communication/data-plane/Chat/readme.md
+    - https://raw.githubusercontent.com/Azure/azure-rest-api-specs/667a97d5f042267a465b1e9b3e67325fccb13153/specification/communication/data-plane/Chat/readme.md
 java: true
 title: AzureCommunicationChatService
 output-folder: ..\