[SIPForum-discussion] Difference in DTMF payloads

Javier Dejo javierd at zyxel.com
Thu Dec 6 17:15:07 UTC 2007

Hi all,


I'm a newbie to this list, and to SIP, and I have a question: What is
the difference between DTMF event payload 100 and 101?


Are them both RFC2833?


I see this on an SDP capture:


Media Attribute (a): fmtp:100 0-15


And somebody told me that it should be 101 instead of 100 because most
carriers today don't even accept 100 anymore.


Thanks in advance for the help!






Javier E. Dejo

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