Refer to the exhibit. Which codec has been negotiated?
The audio media description includes RTP payload type 0 and maps it to PCMU/8000. RTP payload type 0 is PCMU, which is G.711 μ-law (G.711ulaw). Payload type 101 is telephone-event for DTMF signaling rather than a voice codec.
PCMU/8000
telephone-event
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