Re: DTMF is not working in 50% of Outbound IVR based Calls (IPCC
First question is do you need MTP enabled on the SIP trunk? Your gateway and CVP versions are high enough to where you do not need to set MTP Required on the trunk. If you are worried about a dtmf replay mismatch, CUCM will automatically insert an MTP if it detects a dtmf delay mismatch. There is no need to explicitly set one. CVP and CUCM support rfc2833 and the dial-peer is set to rfc2833 as well (rtp-nte). You shouldn't need an MTP in this call flow.
Try disabling the MTP requirement on the trunk and see if that makes a difference. If not, can you get a sniffer capture from the gateway? We can see if the gateway is passing DTMF on the bad calls.
If MTP is required for some reason, can you let me know if you are using software or hardware MTP resources? Do you have any transcoders configured? Send me a 'sh run' from each hardware MTP and transcoder configured.
IntroductionCUCM Routing RulesDial String implementation PolicyCUCM Routing LogicSIP URI Call Routing Analysis+++ Case Study: 1 ++++++ Case Study: 2 +++Conclusion
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