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Exam 350-801 All Questions

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Exam 350-801 topic 1 question 100 discussion

Actual exam question from Cisco's 350-801
Question #: 100
Topic #: 1
[All 350-801 Questions]


Refer to the exhibit. Which outgoing m-line SDP is sent to Cisco UCM after matching the appropriate dial peers via Cisco Unified Border Element?

  • A. m=audio 16550 RTP/AVP 0 8 18 a=rtpmap:0 PCMU/8000/1 a=rtpmap:8 PCMA/8000/1 a=rtpmap:18 G729/8000/1
  • B. m=audio 16550 RTP/AVP 18 0 a=rtpmap:0 PCMU/8000/1 a=rtpmap:18 G729/8000/1
  • C. m=audio 16550 RTP/AVP 8 0 18 a=rtpmap:0 PCMU/8000/1 a=rtpmap:8 PCMA/8000/1 a=rtpmap:18 G729/8000/1
  • D. m=audio 16550 RTP/AVP 18 0 a=rtpmap:8 PCMA/8000/1 a=rtpmap:0 PCMU/8000/1 a=rtpmap:18 G729/8000/1
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Suggested Answer: B 🗳️

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kljw5
3 months ago
Selected Answer: B
This question seems to have no valid correct answer as the incoming SDP only offers 0 and 18 and not 8 so the outgoing SDP would match the available codecs in order of preference based on voice codec 1 which is 0 18. B is the closest available answer although the order of codec preference is incorrect.
upvoted 1 times
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b3532e4
7 months, 3 weeks ago
The outgoing SDP will prefer PCMA (G.711alaw) first (RTP/AVP 8), followed by PCMU (G.711ulaw) (RTP/AVP 0), and finally G.729 (RTP/AVP 18), based on the codec preferences set in the voice-class codec 1 on both dial peers.
upvoted 1 times
kljw5
3 months ago
This is wrong, The incoming SDP does not include 8 which is alaw. 0 and 18 so the outgoing SDP would prioritice ulaw 0 then 18 based on voice codec 1
upvoted 1 times
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pasangawa
11 months, 3 weeks ago
Selected Answer: C
This should be C https://en.wikipedia.org/wiki/RTP_payload_formats 8 - G711alaw 0 -G711ulaw 18 - G729
upvoted 1 times
kljw5
3 months ago
Wrong, incoming SDP does not offer 8
upvoted 1 times
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pasangawa
11 months, 2 weeks ago
change my mind, based on Cisco: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube/ios-xe/config/ios-xe-book/m_voi-negt-aud-code.html#reference_D708A3F6727C4E47BBE1C0B9B417BFA7 In it, this note: Codec preference in the voice class codec on the outgoing call leg is not followed when the same codecs are available in the respective incoming invite with SDP with different codec preference. Cube prioritizes and follows the incoming invite with SDP codec preference when compared to the voice class codec preference on the outgoing dial-peer leg. So should be B.
upvoted 2 times
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Piji
2 years, 8 months ago
Selected Answer: B
B is correct answer.
upvoted 3 times
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Omitted
2 years, 11 months ago
Selected Answer: B
This should be B - it compares with the invite before sending to CUCM leaving G.711ulaw and G.729 remaining. For some reason the order is messed up but it seems like the best answer still.
upvoted 2 times
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A (35%)
C (25%)
B (20%)
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