It should be D "dtmf-relay sip-kpml". UCCX only supports out of band DTMF.
Here is a link about how somebody resolved it. https://community.cisco.com/t5/contact-center/dtmf-not-working-with-uccx/td-p/2317592
I agree the correct answer should be D, also see best practices for some background info
https://www.cisco.com/c/dam/en/us/td/docs/ios-xml/ios/voice/cube_uccx/cube_uccx_interop_bestprac_guide.pdf
configuring the DTMF relay method on a SIP dial-peer can prevent Unified CM from invoking a media resource (like an MTP) for calls to UCCX IVRs. Specifically, if the dial-peer is configured to use RTP NTE as the DTMF relay method, CUCM will attempt to convert in-band DTMF tones to out-of-band signaling messages, which requires an MTP to be present and invoked.
Explanation:
RTP NTE (RFC2833):
This method relays DTMF as in-band tones within the RTP stream.
UCCX and DTMF:
UCCX primarily relies on out-of-band DTMF signaling (like SIP INFO or KPML) to interpret DTMF digits.
CUCM and MTPs:
CUCM can convert in-band RTP NTE to out-of-band signaling if an MTP is configured and invoked.
Avoiding MTPs:
By configuring the dial-peer to use an out-of-band DTMF method (like SIP INFO or KPML) instead of RTP NTE, you can avoid having CUCM attempt to convert the DTMF, thus preventing the need for an MTP to be invoked
C. and D. are correct both.
However, if you want a tiebreaker take in mind the following:
++sip-kpml is DTMF Relay via KPML over SIP SUBCRIBE/NOTIFY, it is a standard (RFC 4730).
++sip-notify is DTMF Relay via SIP NOTIFY messages (also called unsolicited notify). This is a Cisco proprietary implementation and is not standardized in any IETF RFC. It is the same method that Unity and CUCM uses to MWI indicators.
In this scenario, I consider that the correct one, taking in account the consideration about Cisco proprietary, correct answer is C.
Reference:
Understanding SBC's Comprehensive Guide to Designing, Deploying, Troubleshooting, and Maintaining CUBE Solutions.
Nother thing is that it is not mentioned what SBC is in use, it could be an Oracle, a Ribbon, etc. However in the question talking about the dial-peers, it targets to a Cisco Gateway or a CUBE. If we where talking about for example a Asterisk Call Control or a Ribbon SBC, we can consider to choose RFC 4730 (KPML). However in this case the SBC is a CUBE or a Cisco Gateway, so to be more specific and compatibility, C, could be the best answer. It is my criteria, you can choose D that it is correct too, but take in mind that one thing is to be facing a Cisco CCNP exam, and another think is facing a real scenario as for example an implementation or a project.
guys .... I had this issue, and my dial-peers were offering "dtmf-relay rtp-nte sip-notify sip-kpml", yet the DTMF was not being recognized by UCCX. Setting it to only "dtmf-relay sip-kpml" resolved the issue. than answer is D
right in the beginning we can see the answer is wrong here. Correct is D
https://www.cisco.com/c/dam/en/us/td/docs/ios-xml/ios/voice/cube_uccx/cube_uccx_interop_bestprac_guide.pdf
D - dtmf-relay sip-kpml
UCCX only supports out-of-band DTMF. This can be applied at the CUBE to avoid a media resource being needed to address as it can directly handle the DTMF relay from RTP-NTE to SIP-KPML
https://www.cisco.com/c/dam/en/us/td/docs/ios-xml/ios/voice/cube_uccx/cube_uccx_interop_bestprac_guide.pdf
Both C and D are valid answers from the CUBE stand point. CUCM has to convert the OOB DTMF into JTAPI and then send it to UCCX. For a more specific answer, the CUCM configuration has to be counted as well. From my experience working with CUBE, CUCM and UCCX, enabling dtmf-relay sip-kpml at the dial-peer is enough to make it work without an MTP.
Great document. Thanks for the link.
This document specifies both KPML and NOTIFY.
Both are OOB DTMF Methods.
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