Refer to the exhibit. A call is failing to establish between two SIP Devices. The called device answers with this SDP. Which SDP parameter causes this issue?
A.
The payload for G.711ulaw must be 18.
B.
The calling device did not offer a ptime value.
By Elimination: G711ulaw is 0, 18 is G729, ptime value is an optional field, media stream is set to sendrecv not send only. So D is the only viable answer
The format of media announcement is as follows.
m=<media> <port> <transport> <fmt list>
The first sub-field is the media type. Currently defined media for TMedia is "audio".
The second sub-field is the transport port to which the media stream will be sent. In Smart Media we don't specify it in Profile SDP Description and therefore you should insert "0".
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