2. this is SIP Gateway following is the SIP ( DTMF is configured on my Gateway router 2921)
SIP Port = 5060
Voice Codec= G711 A-Law
DTMF = IN-Band DTMF without RFC2833
Signaling IP address = 10.205.20.50
3. I think this is Cisco IP PH setting in Cisco because before it was not working on Linksys SPA 942, 922 but i configured IN-Band in SPA 942,922 and now DTMF is enable and i can Dial landline extensions.
So the gateway through which the call is going, is it added as a gateway or a trunk(sip) on the call manager?
Please confirm the same, if its a SIP trunk on the call manager, then try and change the following parameter:
DTMF Signaling Method to RFC2833, see if this resolves the issue.
As then the DTMF will be sent in band, which the other end is expecting.
From the debugs, i realy can not reach a conclusion, we need more information, if the above does not resolve the issue, i suggest you to open a TAC case, so that we can have a look and do some deeper analysis, and troubleshooting.
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