diff --git a/specification/communication/resource-manager/Microsoft.Communication/preview/2020-08-20-preview/CommunicationService.json b/specification/communication/resource-manager/Microsoft.Communication/preview/2020-08-20-preview/CommunicationService.json
index 6e840a1d9a20..33b5c40e5fef 100644
--- a/specification/communication/resource-manager/Microsoft.Communication/preview/2020-08-20-preview/CommunicationService.json
+++ b/specification/communication/resource-manager/Microsoft.Communication/preview/2020-08-20-preview/CommunicationService.json
@@ -62,6 +62,60 @@
         }
       }
     },
+    "/subscriptions/{subscriptionId}/providers/Microsoft.Communication/checkNameAvailability": {
+      "post": {
+        "description": "Checks that the CommunicationService name is valid and is not already in use.",
+        "operationId": "CommunicationService_CheckNameAvailability",
+        "summary": "Check Name Availability",
+        "tags": [
+          "CommunicationService"
+        ],
+        "parameters": [
+          {
+            "name": "nameAvailabilityParameters",
+            "in": "body",
+            "schema": {
+              "$ref": "#/definitions/NameAvailabilityParameters"
+            },
+            "description": "Parameters supplied to the operation."
+          },
+          {
+            "$ref": "../../../../../common-types/resource-management/v1/types.json#/parameters/SubscriptionIdParameter"
+          },
+          {
+            "$ref": "../../../../../common-types/resource-management/v1/types.json#/parameters/ApiVersionParameter"
+          }
+        ],
+        "consumes": [
+          "application/json"
+        ],
+        "responses": {
+          "200": {
+            "description": "Success. The response describes the name availability.",
+            "schema": {
+              "$ref": "#/definitions/NameAvailability"
+            }
+          },
+          "default": {
+            "description": "Error response describing why the operation failed.",
+            "schema": {
+              "$ref": "#/definitions/ErrorResponse"
+            }
+          }
+        },
+        "produces": [
+          "application/json"
+        ],
+        "x-ms-examples": {
+          "Check name availability available": {
+            "$ref": "./examples/checkNameAvailabilityAvailable.json"
+          },
+          "Check name availability unavailable": {
+            "$ref": "./examples/checkNameAvailabilityUnavailable.json"
+          }
+        }
+      }
+    },
     "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Communication/communicationServices/{communicationServiceName}/linkNotificationHub": {
       "post": {
         "description": "Links an Azure Notification Hub to this communication service.",
@@ -763,6 +817,42 @@
         }
       }
     },
+    "NameAvailabilityParameters": {
+      "description": "Data POST-ed to the nameAvailability action",
+      "required": [
+        "type",
+        "name"
+      ],
+      "type": "object",
+      "properties": {
+        "type": {
+          "description": "The resource type. Should be always \"Microsoft.Communication/CommunicationServices\".",
+          "type": "string"
+        },
+        "name": {
+          "description": "The CommunicationService name to validate. e.g.\"my-CommunicationService-name-here\"",
+          "type": "string"
+        }
+      }
+    },
+    "NameAvailability": {
+      "description": "Result of the request to check name availability. It contains a flag and possible reason of failure.",
+      "type": "object",
+      "properties": {
+        "nameAvailable": {
+          "description": "Indicates whether the name is available or not.",
+          "type": "boolean"
+        },
+        "reason": {
+          "description": "The reason of the availability. Required if name is not available.",
+          "type": "string"
+        },
+        "message": {
+          "description": "The message of the operation.",
+          "type": "string"
+        }
+      }
+    },
     "LinkNotificationHubParameters": {
       "description": "Description of an Azure Notification Hub to link to the communication service",
       "required": [
@@ -796,7 +886,7 @@
       "type": "object",
       "properties": {
         "id": {
-          "description": "The operation Id.",
+          "description": "Fully qualified ID for the operation status.",
           "type": "string",
           "readOnly": true
         },
diff --git a/specification/communication/resource-manager/Microsoft.Communication/preview/2020-08-20-preview/examples/checkNameAvailabilityAvailable.json b/specification/communication/resource-manager/Microsoft.Communication/preview/2020-08-20-preview/examples/checkNameAvailabilityAvailable.json
new file mode 100644
index 000000000000..ed8a879a190e
--- /dev/null
+++ b/specification/communication/resource-manager/Microsoft.Communication/preview/2020-08-20-preview/examples/checkNameAvailabilityAvailable.json
@@ -0,0 +1,19 @@
+{
+  "parameters": {
+    "subscriptionId": "12345",
+    "api-version": "2020-08-20-preview",
+    "nameAvailabilityParameters": {
+      "type": "Microsoft.Communication/CommunicationServices",
+      "name": "MyCommunicationService"
+    }
+  },
+  "responses": {
+    "200": {
+      "body": {
+        "nameAvailable": true,
+        "reason": "NameAvailable",
+        "message": "Requested name is available for the requested type"
+      }
+    }
+  }
+}
diff --git a/specification/communication/resource-manager/Microsoft.Communication/preview/2020-08-20-preview/examples/checkNameAvailabilityUnavailable.json b/specification/communication/resource-manager/Microsoft.Communication/preview/2020-08-20-preview/examples/checkNameAvailabilityUnavailable.json
new file mode 100644
index 000000000000..a2e050f47ccc
--- /dev/null
+++ b/specification/communication/resource-manager/Microsoft.Communication/preview/2020-08-20-preview/examples/checkNameAvailabilityUnavailable.json
@@ -0,0 +1,19 @@
+{
+  "parameters": {
+    "subscriptionId": "12345",
+    "api-version": "2020-08-20-preview",
+    "nameAvailabilityParameters": {
+      "type": "Microsoft.Communication/CommunicationServices",
+      "name": "MyCommunicationService"
+    }
+  },
+  "responses": {
+    "200": {
+      "body": {
+        "nameAvailable": false,
+        "reason": "AlreadyExists",
+        "message": "Requested name is unavailable for the requested type"
+      }
+    }
+  }
+}