BeginDialOut with Office Communicator Clients

Posted by: Clarity Blogs: ASP.NET, on 08 Oct 2009 | View original | Bookmarked: 0 time(s)

Recently I was working on some code to invite new participants to an A/V conference, and learned about some Office Communicator behavior that may throw you off if you are trying to dial out to a URI.

The AudioVideoMcuSession class exposes a BeginDialOut method which tells the MCU to dial out to a particular URI to bring in a new participant. By supplying McuDialOutOptions, you can specify the display name and language to use for the invited participant, which can be useful if you are inviting someone at a PSTN phone number.

If your invitation goes to an endpoint running Office Communicator, though, Communicator will reject the dial-out invitation, take the conference URI, and join the conference itself. Its like those bosses you hear horror stories about who will brashly reject a new idea you propose, and then suggest it themselves at the next company meeting.

So if you call BeginDialOut with a SIP URI and the endpoint that receives the dial-out is a Communicator client, you will see a ConferenceFailureException in your code with the reason userDeclined, but Communicator will still successfully join the conference.

You have two options for dealing with this: you can ignore that particular exception, confirm that the invited participant has joined the conference, and proceed; or you can use the BeginInviteRemoteParticipants method on the Conversation object to bring in the new participants. If all you have is the AudioVideoMcuSession, you can find the associated Conversation at AudioVideoMcuSession.ConferenceSession.Conversation.

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