rfc2833.DTMF.pdf
Thismemodefinestwopayloadformats,oneforcarryingdual-tonemultifrequency(DTMF)digits,otherlineandtrunksignals(Section3),andasecondoneforgeneralmulti-frequencytonesinRTP[1]packets(Section4).SeparateRTPpayloadformatsaredesirablesincelow-ratevoicecodecscannotbeguaranteedtoreproducetheseto
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