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 ...
The last blog entry covered DTMF relay. This blog entry will focus on Cisco IP Phone and Cisco SIP Trunk DTMF relay support. Cisco’s first generation of IP phones do not support RFC2833 DTMF-Relay.
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