A Practical Look at DTMF and RFC 2833/4733

It’s easy to get lost in the technological babble of our industry. We are awash in acronyms, product names, standards (real and pseudo), protocols, and vendor specific terminology. I can’t tell you how many times I thought I was hearing something new only to realize it was just another way of expressing an old idea. It’s almost as if some people use their mastery of mnemonics as a game and the one who can befuddle the most, wins.

In my latest article for No Jitter, I tie together a number of topics previously addressed here on SIP Adventures.

Working With DTMF Transmission at the Packet Level


  1. Excellent!

  2. Deepak Rawat · · Reply


    thanks for sharing such great info . Do you have the information about the rtpmap values 96- 127 and their purpose. I mean when and which number to use ?

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