AnsweredAssumed Answered

Sometimes 3rd party SIP app gets  "Warning: 399” from UCM and can not make call.

Question asked by William Wu on Jul 1, 2016
Latest reply on Jul 1, 2016 by William Wu



       1) 3rd party SIP app running on Mobile registers to UCM and can make call on corporate network.

            Register Call-ID: 39QjZG3VVZ

            INVITE Call-ID: 8E~BnPne~7


       2) Switch the wifi network to a non-corporate network on which UCM is not reachable.


       3) Switch the network back to corporate network, the app re-registers successfully

            Register Call-ID: wskCoc1ein


       4) Make an outgoing call, UCM complains "503 Service Unavailable” and Warning 399.

            INVITE Call-ID: 2ensqmQTFl


      Workaround: Admin resets the device from UCM or wait till old existing sip session expires.


     SDL log attached.