All,
I am seeing an issue where I am unable to call 1 number in the PSTN with a SIP Trunk to an ITSP. All other calls work OK, just not this one.
The ITSP told me to send g711alaw as 1st choice in the early offer and also to change the ptime with a SIP profile to 10ms, which I done also and I still see the same issue.
For the failed call I see a 200 OK received from the ITSP, then the next entry in the log is an UPDATE from the ITSP, the SDP itself looks pretty much the same as the one in the early offer with g711alaw and DTMF 101 etc.. but the CUBE then turns around and sends a 491 Request Pending message back to the ITSP and these then loops and eventually the call fails.
I would normally expect CUBE to send an ACK to the 200 OK and for us to then transmit RTP.
Call flow is CUCM -------->CUBE------------->ITSP
Can anyone please advise?
Thanks
D
