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Exam 350-801 topic 1 question 107 discussion

Actual exam question from Cisco's 350-801
Question #: 107
Topic #: 1
[All 350-801 Questions]


Refer to the exhibit. When a UC Administrator is troubleshooting DTMF negotiated by this SIP INVITE, which two messages should be examined next to further troubleshoot the issue? (Choose two.)

  • A. REGISTER
  • B. UPDATE
  • C. PRACK
  • D. NOTIFY
  • E. SUBSCRIBE
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Suggested Answer: DE 🗳️
by Griswald at June 22, 2020, 10:34 p.m.

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Griswald
Highly Voted 2 years, 12 months ago
The DTMF Events through SIP Signaling feature allows telephone event notifications to be sent through SIP NOTIFY messages, using the SIP SUBSCRIBE/NOTIFY method as defined in the Internet Engineering Task Force (IETF) draft, SIP-Specific Event Notification.
upvoted 17 times
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v1nhthanh
Most Recent 1 month, 4 weeks ago
Selected Answer: DE
No 101 event - therefore OOB. Notify and Subscribe
upvoted 1 times
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Piji
10 months, 1 week ago
Selected Answer: DE
D,E correct answer.
upvoted 2 times
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Konrad88
1 year, 9 months ago
I think it should be B & C (PRACK & UPDATE). Both of these include SDP where DTMF is negotiated.
upvoted 1 times
Konrad88
1 year, 9 months ago
After more study I believe they are looking for SUBSCRIBE & NOTIFY. Seems to be a Cisco thing. I haven't seen it in the general world of SIP.
upvoted 3 times
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MKZ
2 years ago
SUBSCRIBE - subscribes for an event of notification from the notifier ( KPML & MWI) NOTIFY - Notify the subscriber of a new event ( used for KPML $ MWI)
upvoted 4 times
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SDLOA14
2 years, 4 months ago
I'm going to have to investigate this question. I don't see any DTMF negotiation in this message. Nothing like telephony-event 101 configuration.
upvoted 1 times
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MrAshour
2 years, 6 months ago
Thank you so much for the explanation :)
upvoted 2 times
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Community vote distribution
A (35%)
C (25%)
B (20%)
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