Incoming Call to Communicator - call gets disconnected RRS feed

  • Question

  • We are using Call Manager 5.x
    2851 Gateway
    Mediation with 2 NICs

    We tried this without the recent Mediation Server patch and with.  We tried with and without the patch that disabled the scalable networking pack for Server 2003 SP2.  We tried with and without the latest hotfix for Communicator.

    Communicator clients can dial out to the PSTN - audio can be heard on Communicator and PSTN Phone
    Communicator clients can talk to other Communicator clients
    When a PSTN phone calls Communicator, the phone rings on Communicator but as soon as the user goes to pick up the phone, the call gets disconnected and the answer call shows greyed out.

    Anybody have any ideas?
    Wednesday, August 27, 2008 2:05 AM

All replies

  • I would suggest looking at the Media (SDP) negotiation...

    Without knowing the details, the symptom makes me instantly think that the Media is not being negotiated correctly, therefore the disconnect occurs.

    The call is being established, so the SIP signaling seems to be fine. But when you answer the call on Communicator, the Media needs to be correctly negotiated for that call to remain active and pass audio end-to-end.


    An ethernet sniff, would show you this quite quickly (and it would show you who is initiating the disconnect)


    Good Luck



    Wednesday, August 27, 2008 11:06 AM
  • Thank you.  But how do I look at this Media (SDP) negotiation?
    Wednesday, August 27, 2008 12:53 PM
  • Hi,


    If you go on the 2851 and run

    #term mon

    #debug ccsip message


    You should see the SIP call flow along with SDP for your media setup. Ensure you have MTPs available for the SIP trunk from Callmanager to the 2851 also if you are using SIP. Just a thought.





    Thursday, August 28, 2008 2:11 PM