I'm attempting to change the NTE(DTMF) payload type to 100 (from the default of 101) on my outbound calls. I've specified this in the dial-peers, but it seems to ignore me. Here is the outbound dial-peer (this is a H323-SIP CUBE):
Working with TAC, we found that the SDP information is not sent on the SIP leg unless you use Faststart on the outbound H323 leg from UCM. Bummer. The SDP information being sent before was actually the result of a bug CSCsq83476. :)
I'm really hoping Cisco got SIP right in 7.x so you it do SIP trunks properly.
Yes - if you do early offer forced without fast start from the H323 side then that is called "slow start to early media" which I believe is in the restriction list.
Funny enough - it was a 'polish' because of a bug.
Using fast start with CUBE gets around many, many media problems with a H323-SIP CUBE. Some of the media transactions don't map very well, and having early media/fast start fixes many of those issues. Unfortunately this requires the use of an MTP.
I think CUCM 7.x has done quite a bit of work on their SIP trunking.
IntroductionCUCM Routing RulesDial String implementation PolicyCUCM Routing LogicSIP URI Call Routing Analysis+++ Case Study: 1 ++++++ Case Study: 2 +++Conclusion
Over the last few months, I have had the privilege of working on SI...
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