3 Replies Latest reply on Feb 23, 2016 11:16 AM by braintoss

    SIP Call Terminated after 2nd Invite

    jctop New Member

      Greetings All,


      I hope I haven't missed a previous thread on this.  Here is the scenario:


      Carrier hand off to an Adtran.  Originally it was a 3448 but we're putting in a 6210 instead.

      IPBX is ShoreTel with a connection to their Call Center Product (separate server).


      Carrier - .198

      Adtran - .196

      PBX Server .200

      ECC Server .201

      SIP Trunk Switch .208



      Call comes in hits an Auto Attendant on .200 (Full audio) and once you press an option to get transferred to the call center server .201 , it has a faint clicking sound followed by silence and a loss of the audio stream.


      Upon looking at the pcap, it appears that the transfer to .201 is successful and establishes the audio stream to the Contact Center Server .201 , but immediately after the trunk switch .208 initiates a new invite back out to the Adtran, which starts a chain of invite SDP, 100 trying, and bouncing between ShoreTel <> Adtran  and  Adtran <> Carrier  until eventually the ShoreTel sends a bye message.


      I'm guessing that this second invite is to put the caller on hold or to re-invite as it presents to the agent.  With an Ingate SBC there is a setting called inhibit hold to handle this type of situation, or a setting with the signaling order of re-invites, but we much prefer the usage of Adtran's SBCs. 


      Is there something specific that has to be done in Adtran programming to allow for this or do the 6000 series / 908e's do this natively?


      Appreciate any guidance