Calls inbound from SIP Provider to CME/CUE (B2BUA) are disconnect at 30 seconds into voicemail.
My understanding is that RTCP reports should be sent from the RTP endpoints to keep the RTP session alive in this kind of situation (one direction is muted).
At 30 seconds into leaving a voicemail, we receive a "BYE" from the SIP provider.
Running debug voip rtcp, and even ip packet shows NO RTCP packets being sent from the Router - 12.4(24)T
Looking at "show call active voice brief" shows that there is no increase in the RX traffic on the CUE call leg while the voicemail message is being recorded.
17B0 : 495 590510970ms.1 +90 pid:2 Originate 300 active
dur 00:00:36 tx:1805/288800 rx:681/108483
IP 172.16.2.2:16906 SRTP: off rtt:0ms pl:0/0ms lost:0/0/0 delay:0/0/0ms g711ulaw TextRelay: off
media inactive detected:n media contrl rcvd:n/a timestamp:n/a
long duration call detected:n long duration call duration:n/a timestamp:n/a
CiscoIOS was recently upgraded to 12.4(24)T. CUE is v2.3(2).
This router is also performing NAT between the SIP provider and the Voice subnet.
1) Is it up to CUE to initiate all RTP and RTCP traffic with the B2B-UA just passing along the packets? What is the expected or required RTCP/RTP behavior in a B2B-UA environment?
2) How can I confirm if CUE is sending RTCP packets and if they are received and forwarded by CiscoIOS.
Any help would be much appreciated.