# Azure Communication Services SMS Enables ngSurvey to use Azure Communication Services as an SMS provider. ## 🔅 Communication Services Properties * **`ConnectionString`**is the connection string provided in Communication Services resource Settings / Key page. * **`From Number`** Is the verified phone number that you registered under your communication services account SMS section. * **`Event webhook`** can be used to to handle asynchronous call backs to flag failed numbers in sms campaigns. You can use the webhook by setting up a new Event Subscription wiith a Webhook endpoint type. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.ngsurvey.com/installation-setup/system-settings/mobile-messenging/iis-smtp-exchange-server-1.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.