CUBE / IP-IP gateway: slow (4 seconds) translation from H.245 DTMF to RTP NTE
I just opened a TAC case on it too, but I'm wondering if anyone here run into this before. I am having a problem with a CUBE gateway. It's a 2811 running latest 12.4(24)T3.
Incoming call leg is from H.323 Avaya gateway that is sending DTMF using out of band H.245 signalling. I can see those in "debug h245 asn1". The outgoing call leg is to an Oracle CCA call center that is expecting RFC2833 RTP NTE DTMF. I can see those messages sent from CUBE with "debug voip rtp session event". So CUBE is doing translation just fine, the only problem is that it takes 4 seconds to do the translation. There's a 4 second gap between the H.245 debug message and the RTP NTE debug message. Users are reporting similar behavior, they press a digit and it takes 4 seconds before IVR responds to input.
The inbound dial-peer is configured for h.245-alphanumeric for dtmf-relay. Here's the outbound dial-peer:
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