SIP 488 Disconnect - Negotiated Codec Byte & Source IP Port
I'm having a strange issue...wondering if anyone has seen this before:
Our scenario is the following setup:
H323 Gateway -> CUCM -> SIP CUBE à PSTN
We have multiple cubes all over the world (USA, UK, Singapore, ect). All the cubes have the same config and are running very similar IOS versions. However, one CUBE (the one in the UK) is not able to properly negotiate codec Byte size without an MTP required on the sip trunk (should be 40 Bytes).
We are using Early offer on all the CUBES, however, I have selected Early offer support for voice and video calls (insert MTP if needed) on the SIP Profile. Additionally, selecting MTP required on the sip trunk gives us no ringback.
Also, I have tested this with a SIP VGW, and a SCCP phone – there were no issues so this only seems to affect H323. On the H323 Gateway I have tried enabling outbound faststart, but this makes no difference.
What is strange is the codec is being negotiated ok, but the media source port and the codec bytes are not being negotiated at all:
Here is a debug ccsip calls output.
CUBE: 184.108.40.206 (this is actually an internal IP that is reachable by all devices, our network engineering team over in the UK decided they were too cool for private addressing)
006082: Aug 28 12:03:07.062: //400617/D318D8800000/SIP/Call/sipSPICallInfo:
IntroductionCUCM Routing RulesDial String implementation PolicyCUCM Routing LogicSIP URI Call Routing Analysis+++ Case Study: 1 ++++++ Case Study: 2 +++Conclusion
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