diff --git a/specification/communication/data-plane/ShortCodes/preview/2021-10-25-preview/shortcodes.json b/specification/communication/data-plane/ShortCodes/preview/2021-10-25-preview/shortcodes.json
index 4b273a0d67cb..72e0566d0ca9 100644
--- a/specification/communication/data-plane/ShortCodes/preview/2021-10-25-preview/shortcodes.json
+++ b/specification/communication/data-plane/ShortCodes/preview/2021-10-25-preview/shortcodes.json
@@ -316,7 +316,11 @@
             "shortCode",
             "alphaId"
           ],
-          "type": "string"
+          "type": "string",
+          "x-ms-enum": {
+            "name": "NumberType",
+            "modelAsString": true
+          }
         },
         "countryCode": {
           "description": "ISO 3166 2-char code representing the country e.g. 'US'.",