Topic: 350-801 topic 1 question 437

Refer to the exhibit.



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.

Re: 350-801 topic 1 question 437

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