International Call Failure

Unanswered Question
Feb 11th, 2008
User Badges:

I register 2 IP Communicator to the CCM 5.0.4.. From CCM is connected (SIP trunk) to Xener SoftSwitch that have to Voice gateway to PSTN and Internet Carrier. My IP Phones can call to national PSTN, but to international call via Internet Carrier Phone is failed.

My questions are:

1) Is it related to incoming port in SIP security profile or destination port in SIP trunk?

2) Is it related to MTP or DTMF?

3) FYI, the softswitch require SDP to be invited to it from CCM, and from the RTMT log, there are no "INVITE SDP". How to enable the "fast start" or "early offer"?

Please help.

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
htarra Fri, 02/15/2008 - 11:45
User Badges:
  • Bronze, 100 points or more

International calls may fail due to the additional time taken to locate the user. International calls generally take longer due to multiple systems processing the connection. The workaround is to wind out timers, which allow the call setup enough time to complete the connection.You can resolve this issue in either the Cisco CallManager or the Survivable Remote Site Telephony (SRST) gateway. It is not related to incoming port in SIP security .


This Discussion