What is the codec preference line in the initial SIP INVITE SDP?


Refer to the exhibit. In this Cisco UCM setup configured for EARLY OFFER, what is the codec preference line in the initial SIP INVITE SDP?
A. m=audio 16444 RTP/AVP 9 0 8 18 101
B. m=audio 16444 RTP/AVP 0 8 18 101
C. m=audio 16444 RTP/AVP 9 18 101
D. m=audio 16444 RTP/AVP 18 101

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One thought on “What is the codec preference line in the initial SIP INVITE SDP?

  1. Answer is C.

    First the bandwidth for region is 40k so G711 is not supported.

    Now the payload type for G722 is 9. For G729 is 18. As for G711 is 0.

    Payload type 101 is for rtp-nte which is the in-band DTMF relay mechanism.

    1. if G711 is not supported for 40k neither is 722 for the same reason?
      g729 is the only one small enough so it would be D – 18 101?

      12

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