Revert set up expansion, add PSTn example and set up delegates prereq

Author: charithgunaratna

articles/communication-services/how-tos/cte-calling-sdk/includes/shared-line-appearance/shared-line-appearance-web.md

@@ -23,6 +23,12 @@ const teamsCallOptions = { onBehalfOfOptions: onBehalfOfOptions };
 const call = teamsCallAgent.startCall([{ microsoftTeamsUserId: "yyyyyyyy-yyyy-yyyy-yyyy-yyyyyyyyyyyy" }], teamsCallOptions);
 ```
 
+To place a call to a PSTN user on behalf of a Microsoft Teams user, use `PhoneNumberIdentifier` for call participant.
+
+```js
+const call = teamsCallAgent.startCall([{ phoneNumber: "+1xxxxxxxxxx" }], teamsCallOptions);
+```
+
 ## Receive a call on behalf of a Microsoft Teams user
 
 To receive calls on behalf of a delegator,

articles/communication-services/how-tos/cte-calling-sdk/shared-line-appearance.md

@@ -19,6 +19,7 @@ This article describes how to implement Microsoft Teams Shared Line Appearance w
 - A user access token to enable the calling client. For more information, see [Create and manage access tokens](../../quickstarts/identity/access-tokens.md).
 - Licensing requiremnets for delegator and delegates . See [Teams phone license](https://learn.microsoft.com/microsoftteams/shared-line-appearance#license-required).
 - Enable delegation and shared line appearance. See [Enable delegation](https://learn.microsoft.com/microsoftteams/shared-line-appearance#enable-delegation-and-shared-line-appearance)
+- Assign delegates using [Microsoft Teams Client](https://support.microsoft.com/office/share-a-phone-line-with-a-delegate-in-microsoft-teams-16307929-a51f-43fc-8323-3b1bf115e5a8) or [Teams PowerShell](https://learn.microsoft.com/microsoftteams/shared-line-appearance#use-powershell).
 - Optional: Complete the quickstart to add voice calling to Microsoft Teams user. See [Quickstart: Add voice calling to Microsoft Teams user](../../quickstarts/voice-video-calling/get-started-call-to-teams-user.md).
 
 ## Support