In band DTMF-Relay will use a special payload type identifier (PTI) in the RTP header of the voice media stream to distinguish digits from the DTMF pad from actual voice communication. An out of band ...
Though many of us will never have experimented with it, most readers should be familiar with DTMF as the tones used by the telephone system for dialling. If your youth was not misspent mashing 4-4-2-6 ...
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