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All, We are using a SIP provider that is expecting 0-15 response for fmtp. Our CVS Head asterisk server is sending 0-16, I looked up an rfc and it stated: RTP Payloads for Telephone Signal Events RFC 2833 Henning Schulzrinne, Scott Petrack. May 2000 Implementation notes: * Implementations can support events 0 through 15 (DTMF) by simply ignoring the packets, but MUST declare all event numbers that are meaningful to it in the fmtp parameter, including 0 through 15 Any ideas? Thanks!