When calling 8005201221 you are unable to hear ringback and the call would never connect, hence the report of dead air. You would see the SIP Invites going out and you are getting the 100 trying and the 183 session progress. But you never got a 200 ok. You enabled outbound faststart on the CUCM H323 GW config page and the call went through. You heard audio but your DTMF was not being recognized and you were still not seeing a 200 ok coming in from the ISTP. You saw that the inbound dial-peer that was being matched for the leg between the CUCM and the CUBE was a SIP dial-peer with dtmf-relay rtp-nte. This dial-peer was being matched because of the generic incoming called-number .
The above mentioned issue could happen because it was matching the wrong dial-peer.
The dial-peer it was matching has wrong DTMF type setup.
1809 : 5119 17:13:43.208 EDT Tue Oct 30 2012.1 +3630 pid:30369 Answer 5742930581 active
dur 00:00:03 tx:173/27680 rx:147/23520
IP 10.1.110.254:20146 SRTP: off rtt:0ms pl:0/0ms lost:0/0/0 delay:0/0/0ms g711ulaw
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
The following dial-peer was setup to resolve the issue.
This dial-peer was setup for RTP-NTE.
dial-peer voice 30369 voip
no incoming called-number 1[2-9]..[2-9]......
dial-peer voice 30371 voip
description Long Distance DIALING FROM CUCM
incoming called-number 1[2-9]..[2-9]......
voice-class codec 1
voice-class h323 1
ip qos dscp cs3 signaling
All inbound calls to CUCM endpoints had specific dialed strings. It was not just an prefix with DNs in the last 4 positions. This allowed to be a bit more broad with the dial-peers used for a call from CUCM to the ITSP.
dial-peer voice 1 voip
description LD OUT TO ITSP
session protocol sipv2
dial-peer voice 2 voip
description LOCAL OUT TO ITSP
session protocol sipv2
After this the outbound calls would set up normally and DTMF was recognized.
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