Call forwarding, UCMA, and “derived conversations”

If you have a UCMA application that communicates with users via both IM and audio in the same conversation, you may one day be caught off guard by the following exception:

Microsoft.Rtc.Signaling.OperationFailureException: Application must register 
for ConversationChanged event when a call is moved to a derived conversation.

Specifically, this exception occurs if you try to add audio to a conversation that currently only has instant messaging and/or application sharing, and the remote party redirects the audio call to a PSTN phone; maybe because they don’t have headphones plugged in, or because they are on a wireless network which has been causing poor audio quality, or even because they are logged in on a client that doesn’t support audio. Continue reading “Call forwarding, UCMA, and “derived conversations”” »

How to know when voicemail answers a Lync call

If you have a UCMA application that does call routing, particularly one that is designed to get callers to an available person, you may need a way to figure out whether your call has been answered by the person you were trying to dial, using Lync; whether it has been picked up by Exchange UM voicemail; or whether it has been redirected to another Lync user or a PSTN phone number. This way, you can avoid situations like sending an irritable customer who wants immediate assistance to the voicemail box of someone whose name they have never heard before. Continue reading “How to know when voicemail answers a Lync call” »