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