An administrator is attempting to resolve a DTMF issue to a specific IVR and has supplied logs from the most recent issue. What is the cause and solution of the issue?
A.
The local endpoint supports RFC2833, and the IVR supports only KPML. Configure an MTP to resolve the DTMF mismatch.
B.
The local endpoint does not support RFC2833, and the IVR supports only RFC2833. Configure a transcoder to resolve the DTMF mismatch.
C.
The local endpoint does not support RFC2833, and the IVR supports only RFC 2833. Configure an MTP to resolve the DTMF mismatch.
D.
The local endpoint supports RFC2833, and the IVR supports only KPML. Configure a transcoder to resolve the DTMF mismatch.
*By endpoints here I mean a Phone/IVR/voicemail application and the gateway/trunk.
*The "mLocalDtmfCaps" refers to the dtmf methods supported by CUCM.
Then:
A. and D are incorrect.The local endpoint (CUCM in behalf of the phone) does not support RFC2833 here.
Now, it is necessary to question, what is needed to DTMF interworking between in-band and OOB?
To interworking DTMF, it is needed to use MTP in a supported codec of course, but in general, to do DTMF interworking essencially it is the reason to be of the MTP. If there is any codec mismatch, transcoding enters in scene, but it is other stuff.
So, in order of the above, correct answer is C. I though the solution was B, however, reviewing the following reference, I realized that C is the correct answer.
"Understanding DTMF negotiation and troubleshooting on SIP Trunks"
https://community.cisco.com/t5/collaboration-knowledge-base/understanding-dtmf-negotiation-and-troubleshooting-on-sip-trunks/ta-p/3152511
"Configure DTMF Relay on CUBE"
https://www.cisco.com/c/en/us/support/docs/unified-communications/unified-border-element/200412-DTMF-Relay-and-Interworking-on-CUBE.html#toc-hId-996216602
I would say it's C.
mLocalDtmfCaps has KPML=1, Inband=0, so that means the local endpoint does not support RFC2833.
mEndpointsDtmfCaps would be the IVR and it has the opposite (KPML=0, Inband=1).
For that scenario I think an MTP would be the way to go, not an transcoder:
"C. Need MTP
In this scenario, SCCP EP supports OOB only, and SIP EP supports RFC2833 only. Therefore an MTP is needed. MTP will send\receive RFC2833 packets to\from the SIP EP and will send\receive OOB DTMF packets to\from CCM. CCM will send\receive OOB DTMF packets to\from MTP and the SCCP phone."
https://www.cisco.com/c/en/us/support/docs/unified-communications/unified-communications-manager-callmanager/118708-technote-dtmf-00.html
C is correct.
https://community.cisco.com/t5/collaboration-knowledge-base/understanding-dtmf-negotiation-and-troubleshooting-on-sip-trunks/ta-p/3152511
upvoted 1 times
...
...
This section is not available anymore. Please use the main Exam Page.350-801 Exam Questions
Log in to ExamTopics
Sign in:
Community vote distribution
A (35%)
C (25%)
B (20%)
Other
Most Voted
A voting comment increases the vote count for the chosen answer by one.
Upvoting a comment with a selected answer will also increase the vote count towards that answer by one.
So if you see a comment that you already agree with, you can upvote it instead of posting a new comment.
G0y0
2 months agoG0y0
2 months ago61d0d9d
3 months, 1 week agodecdca7
5 months, 3 weeks agoTheBabu
1 year agorick2
3 months ago