350-801 · Question #6
Refer to the exhibit. Endpoint A calls endpoint B. What is the only audio codec that can be used for the call?
The correct answer is D. G7221/16000. In SIP/SDP codec negotiation, the call can only use a codec that both endpoints list in their SDP offers. The 'only' codec available for the call is the one that appears in both endpoints' capability lists - the intersection. Based on the exhibit, G7221/16000 (Siren 14, a…
Question
Refer to the exhibit. Endpoint A calls endpoint B. What is the only audio codec that can be used for the call?
Exhibit
Options
- AG722/8000
- BPCMA/8000
- CTelephone-event/8000
- DG7221/16000
How the community answered
(19 responses)- A5% (1)
- B5% (1)
- C11% (2)
- D79% (15)
Explanation
In SIP/SDP codec negotiation, the call can only use a codec that both endpoints list in their SDP offers. The 'only' codec available for the call is the one that appears in both endpoints' capability lists - the intersection. Based on the exhibit, G7221/16000 (Siren 14, a wideband codec operating at 16 kHz sampling rate) is the single codec present in both Endpoint A's and Endpoint B's SDP. G722/8000 and PCMA/8000 appear only on one endpoint's list, and Telephone-event/8000 is an RFC 2833 DTMF event payload type, not an audio media codec. Therefore G7221/16000 is the only usable audio codec for the call.
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