[cisco-voip] DTMF fun

[Rhodium]

The easiest point for me to start to troubleshoot this would be the gateway's H.323 connection to the PABX.

CUCM sends DTMF via H245 signal (accepting H245 alphanumeric [AN] only) so you need to determine what type of DTMF relay your PABX supports? Does it support H245 Signal or H245 AN.

You can run "debug h245 asn1" to see what type of relay is being used on the gateway (config dependent) and see whether all the digits are being sent to the PABX and received from the CUCM. If you are seeing the correct digits, then you know that the PABX is not accepting all the digits, if you are not seeing all the digits, the problem is between the PSTN and your gateway. 

HTH.