: The media description received from the remote SIP peer has an invalid content type 'multipart/alternative'.Īt .ctor(LoggingContext loggingContext, ContentDescription rtcRemoteMediaOffer)Īt .CreateMediaNegotiation(ContentDescription rtcMediaDescription, SessionInfo sessionInfo, CallInfo callInfo, IPEndPoint sipPeerEndpoint)Īt .Initialize(SessionInfo sessionInfo, SessionReceivedEventArgs e, CallInfo callInfo, EventSerializer serializer, SpeechSession speechSession, Boolean isTlsConnection)Īt .ctor(SessionInfo sessionInfo, SessionReceivedEventArgs e, CallInfo callInfo)Īt .CreateSession(Int32 inviteReceivedTickCount, SessionReceivedEventArgs e)Īt .SignalingSessionReceived(Object sender, SessionReceivedEventArgs e) The Telephony Manager declined a call with Call Id 'fbcf5611-9d91-4c07-a5be-d9004642c43e' for the following reason in component telephony session: 'The media description received from the remote SIP peer has an invalid content type 'multipart/alternative'.'.įurther trace information for support personnel follows:

My belief is that the UM server is serving up a content type not compatible with the 2013 iPhone app, or the app is trying to connect using an invalid content type.Ī very specific problem, I know, but does anyone have any ideas or advice? I have searched the error and all I get is a load of posts saying it's a red herring. The only obvious clue to the problem is the following error in the event log of the Exchange UM server, corresponding exactly with the time of the failed call to either the attendant or VM. We have the latest CU for Exchange 2007 (in readiness for the upgrade to 2013 some time in the next few months) and the latest CU for Lync 2013 (as evidenced by the fact we have the Lync 2013 iPhone app working). We cannot access the attendant or voicemail via a Lync call from the iPhone app: 'The call couldn't be completed.

The UM attendant and voicemail works fine from the standard Lync 2013 PC client.įrom the new 2013 iPhone app, we can make enterprise voice and video calls just fine - a great new feature which we love! Maybe a rather unusual combination, but we are running Lync 2013 with Exchange 2007 for UM.

Microsoft lync 2013 for iphone