diff --git a/specification/communication/data-plane/PhoneNumbers/preview/2023-05-01-preview/phonenumbers.json b/specification/communication/data-plane/PhoneNumbers/preview/2023-05-01-preview/phonenumbers.json
index c671f76c0379..d5511aba034e 100644
--- a/specification/communication/data-plane/PhoneNumbers/preview/2023-05-01-preview/phonenumbers.json
+++ b/specification/communication/data-plane/PhoneNumbers/preview/2023-05-01-preview/phonenumbers.json
@@ -1515,6 +1515,10 @@
             "modelAsString": true
           }
         },
+        "isoCountryCode": {
+          "description": "ISO country code associated with the phone number.",
+          "type": "string"
+        },
         "operatorDetails": {
           "$ref": "#/definitions/OperatorDetails"
         }