350-801 · Question #148
350-801 Question #148: Real Exam Question with Answer & Explanation
The correct answer is A: G.711ulaw. Those are the codecs. They are RTP payload types, and in preference order. Eg 8=g711alaw, 0=g711ulaw, 18=g729, 97=this one is special, it's actually what they want to Mark RTP-NTP (RFC2833) DTMF relay as. https://community.cisco.com/t5/ip-telephony-and-phones/sip-sdp-no-codec-spe
Question
A Cisco IP Phone 7841 that is registered to a Cisco Unified Communications Manager with default configuration receives a call setup message. Which codec is negotiated when the SDP offer includes this line of text? M=audio 498181 RTP/AVP 0 8 97
Options
- AG.711ulaw
- BiLBC
- CG.711alaw
- DG.722
Explanation
Those are the codecs. They are RTP payload types, and in preference order. Eg 8=g711alaw, 0=g711ulaw, 18=g729, 97=this one is special, it's actually what they want to Mark RTP-NTP (RFC2833) DTMF relay as. https://community.cisco.com/t5/ip-telephony-and-phones/sip-sdp-no-codec-specifed/td-p/3913990 https://en.m.wikipedia.org/wiki/RTP_payload_formats
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