diff --git a/specification/communication/data-plane/NetworkTraversal/preview/2021-10-08-preview/CommunicationNetworkTraversal.json b/specification/communication/data-plane/NetworkTraversal/preview/2021-10-08-preview/CommunicationNetworkTraversal.json
new file mode 100644
index 000000000000..d2fb65ae0878
--- /dev/null
+++ b/specification/communication/data-plane/NetworkTraversal/preview/2021-10-08-preview/CommunicationNetworkTraversal.json
@@ -0,0 +1,171 @@
+{
+  "swagger": "2.0",
+  "info": {
+    "title": "CommunicationNetworkingClient",
+    "description": "Azure Communication Networking Service",
+    "version": "2021-10-08-preview"
+  },
+  "paths": {
+    "/networktraversal/:issueRelayConfiguration": {
+      "post": {
+        "tags": [
+          "Turn"
+        ],
+        "summary": "Issue a configuration for an STUN/TURN server for an existing identity.",
+        "operationId": "CommunicationNetworkTraversal_IssueRelayConfiguration",
+        "consumes": [
+          "application/json"
+        ],
+        "produces": [
+          "application/json"
+        ],
+        "parameters": [
+          {
+            "$ref": "#/parameters/ApiVersionParameter"
+          },
+          {
+            "in": "body",
+            "name": "body",
+            "schema": {
+              "$ref": "#/definitions/CommunicationRelayConfigurationRequest"
+            }
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Success",
+            "schema": {
+              "$ref": "#/definitions/CommunicationRelayConfiguration"
+            }
+          },
+          "default": {
+            "description": "Error",
+            "schema": {
+              "$ref": "../../../Common/stable/2021-03-07/common.json#/definitions/CommunicationErrorResponse"
+            }
+          }
+        },
+        "x-ms-examples": {
+          "Issue Relay Configuration": {
+            "$ref": "./examples/IssueRelayConfiguration.json"
+          }
+        }
+      }
+    }
+  },
+  "definitions": {
+    "CommunicationRelayConfigurationRequest": {
+      "description": "Request for a CommunicationRelayConfiguration.",
+      "type": "object",
+      "properties": {
+        "id": {
+          "description": "An existing ACS identity.",
+          "type": "string"
+        },
+        "routeType": {
+          "description": "The routing methodology to where the ICE server will be located from the client.",
+          "type": "string",
+          "default": "any",
+          "enum": [
+            "any",
+            "nearest"
+          ]
+        }
+      }
+    },
+    "CommunicationIceServer": {
+      "description": "An instance of a STUN/TURN server with credentials to be used for ICE negotiation.",
+      "required": [
+        "credential",
+        "urls",
+        "username",
+        "routeType"
+      ],
+      "type": "object",
+      "properties": {
+        "urls": {
+          "description": "List of STUN/TURN server URLs.",
+          "type": "array",
+          "items": {
+            "type": "string"
+          }
+        },
+        "username": {
+          "description": "User account name which uniquely identifies the credentials.",
+          "type": "string"
+        },
+        "credential": {
+          "description": "Credential for the server.",
+          "type": "string"
+        },
+        "routeType": {
+          "description": "The routing methodology to where the ICE server will be located from the client.",
+          "type": "string",
+          "enum": [
+            "any",
+            "nearest"
+          ]
+        }
+      }
+    },
+    "CommunicationRelayConfiguration": {
+      "description": "A relay configuration containing the STUN/TURN URLs and credentials.",
+      "required": [
+        "expiresOn",
+        "iceServers"
+      ],
+      "type": "object",
+      "properties": {
+        "expiresOn": {
+          "format": "date-time",
+          "description": "The date for which the username and credentials are not longer valid.",
+          "type": "string"
+        },
+        "iceServers": {
+          "description": "An array representing the credentials and the STUN/TURN server URLs for use in ICE negotiations.",
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/CommunicationIceServer"
+          }
+        }
+      }
+    }
+  },
+  "parameters": {
+    "ApiVersionParameter": {
+      "in": "query",
+      "name": "api-version",
+      "description": "Version of API to invoke.",
+      "required": true,
+      "enum": [
+        "2021-10-08-preview"
+      ],
+      "type": "string"
+    }
+  },
+  "securityDefinitions": {
+    "azure_auth": {
+      "type": "oauth2",
+      "flow": "implicit",
+      "authorizationUrl": "https://login.microsoftonline.com/common/oauth2/authorize",
+      "scopes": {
+        "user_impersonation": "impersonate your user account"
+      }
+    }
+  },
+  "x-ms-parameterized-host": {
+    "hostTemplate": "{endpoint}",
+    "useSchemePrefix": false,
+    "parameters": [
+      {
+        "name": "endpoint",
+        "description": "The communication resource, for example https://my-resource.communication.azure.com",
+        "required": true,
+        "type": "string",
+        "in": "path",
+        "x-ms-skip-url-encoding": true,
+        "x-ms-parameter-location": "client"
+      }
+    ]
+  }
+}
diff --git a/specification/communication/data-plane/NetworkTraversal/preview/2021-10-08-preview/examples/IssueRelayConfiguration.json b/specification/communication/data-plane/NetworkTraversal/preview/2021-10-08-preview/examples/IssueRelayConfiguration.json
new file mode 100644
index 000000000000..0927f60852e7
--- /dev/null
+++ b/specification/communication/data-plane/NetworkTraversal/preview/2021-10-08-preview/examples/IssueRelayConfiguration.json
@@ -0,0 +1,28 @@
+{
+  "parameters": {
+    "api-version": "2021-10-08-preview",
+    "content-type": "application/json",
+    "body": {
+      "id": "8:acs:2dee53b4-368b-45b4-ab52-8493fb117652_00000005-14a2-493b-8a72-5a3a0d000081"
+    },
+    "endpoint": "https://my-resource.communication.azure.com"
+  },
+  "responses": {
+    "200": {
+      "body": {
+        "expiresOn": "2021-11-10T21:39:39.3244584+00:00",
+        "iceServers": [
+          {
+            "urls": [
+              "turn:131.107.255.255:3478",
+              "stun:131.107.255.255:3478"
+            ],
+            "username": "AgAAJNOeygwB1uVGvuwAVMHV4PLhYDgY66Fg1dUZvQ4AAAAEhXrhc8uJFjOK8lxEsZk3KIpWxc0=",
+            "credential": "9rl8ablFWj6/aqSuPLgLykLZKqw=",
+            "routeType": "any"
+          }
+        ]
+      }
+    }
+  }
+}
diff --git a/specification/communication/data-plane/NetworkTraversal/readme.md b/specification/communication/data-plane/NetworkTraversal/readme.md
index de431910454a..d8e5e19406b2 100644
--- a/specification/communication/data-plane/NetworkTraversal/readme.md
+++ b/specification/communication/data-plane/NetworkTraversal/readme.md
@@ -49,6 +49,15 @@ input-file:
   - preview/2021-06-21-preview/CommunicationNetworkTraversal.json
 ```
 
+### Tag: package-2021-10-08-preview
+
+These settings apply only when `--tag=package-2021-10-08-preview` is specified on the command line.
+
+```yaml $(tag) == 'package-2021-10-08-preview'
+input-file:
+  - preview/2021-10-08-preview/CommunicationNetworkTraversal.json
+```
+
 ---
 
 # Code Generation