> For the complete documentation index, see [llms.txt](https://docs.ngsurvey.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ngsurvey.com/installation-setup/system-settings/mobile-messenging/iis-smtp-exchange-server-1.md).

# 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.


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