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?

The correct answer is C. m=audio 16444 RTP/AVP 18 101. 40kbps will not allow G.711 & G.722 to be advertised as they have bandwidth of 64kbps, only G.729 will be allowed. https://en.m.wikipedia.org/wiki/RTP_payload_formats

On-Premises Call Control

Question

Exhibit

Options

Am=audio 16444 RTP/AVP 9 18 101
Bm=audio 16444 RTP/AVP 0 8 18 101
Cm=audio 16444 RTP/AVP 18 101
Dm=audio 16444 RTP/AVP 9 0 8 18 101

How the community answered

(25 responses)

A
4% (1)
B
4% (1)
C
80% (20)
D
12% (3)

Explanation

40kbps will not allow G.711 & G.722 to be advertised as they have bandwidth of 64kbps, only G.729 will be allowed. https://en.m.wikipedia.org/wiki/RTP_payload_formats

Topics

#SIP#SDP#Codecs#Cisco UCM

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