as i was trying to figure this out... when i change the codec settings to G729 from G711 under the CCX->system parameters>media parameters i don't get disconnected, rather i get to the MoH after the ivr prompts but get silence instead of the prompts...
What codec did you deploy your UCCX server with? G.711 or G.729?
Are your region settings in CUCM setup to allow G.711 or G.729 directly from the gateway's region to your agent's region? Check to see that you are not engaging a transcoder.
Get rid of the h245-signal on your dtmf relay statement on Dial-peer 3000.
On another note, UCCX only supports G.711 uLaw as do all Cisco IP Phones. The voice gateway will auto-magically transform aLaw into uLaw for you without any need for an MTP, Transcoder, etc... so change your voice-class codec to just use g711ulaw only first and then g.729 second. Don't worry about aLaw unless you are cross-connecting to another aLaw system.
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