Merge pull request #296360 from lisaleehan/patch-8

Update manage-calls-windows.md

Author: prmerger-automator[bot]

articles/communication-services/how-tos/calling-sdk/includes/manage-calls/manage-calls-windows.md

@@ -143,6 +143,8 @@ await this.call.UnmuteOutgoingAudioAsync();
 > [!NOTE]
 > To use this API please use the Azure Communication Services Calling Windows SDK version 1.9.0 or higher. 
 
+Now when a PSTN participant is muted, they should get an announcement that they have been muted and that they can press a key combination (e.g. *6) to unmute themselves. When they press *6, they should be unmuted.
+
 To mute all other participants or mute a specific participant, you can use the asynchronous APIs `MuteAllRemoteParticipantsAsync` on the call and `MuteAsync` on the remote participant:
 
 ```csharp