Nicholas Matthews Tue, 01/13/2009 - 07:06
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This will be done on a per protocol basis, at least in a Cisco perspective.


Here's the SIP guide:

http://www.cisco.com/en/US/docs/ios/voice/sip/configuration/guide/sip_cg-dtmf.html


MGCP:

http://www.cisco.com/en/US/docs/ios/12_2t/12_2t8/feature/guide/ftmgcpfx.html


Generic:

http://www.cisco.com/en/US/docs/ios/voice/fxs/configuration/guide/fxsrelay.html



You can look at ITU specification Q.24 as well for details on the specifics. I'll attach that for you.



hth,

nick



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