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https://community.cisco.com/t5/collaboration-voice-and-video/understanding-sip-dtmf-options-supported-by-cucm/ba-p/3107307
Out-of-band (OOB) SIP DTMF signalling methods include Unsolicited Notify (UN), Information (INFO), and Key Press Mark-up Language (KPML). KPML (RFC 4730) is the OOB signalling method preferred by Cisco and is supported by Cisco Unified CM, Cisco IOS platforms (Release 12.4 and later), and most models of Cisco Unified IP Phones.
https://community.cisco.com/t5/ip-telephony-and-phones/dtmf-issue-via-sip-trunk/td-p/2775829
Nov 16, 2015 · SIP by default (if nothing else is explicity configured) uses RFC 2833 DTMF which is inband. Hence inband <-> OOb will invoke MTP from CUCM side. If you share the traces, we can see why MTP allocation is failing or why MTP is failing to do the DTMF conversion. Or easiest fix is to use KPML or SIP NOTIFY on the CUCM <-> CUBE leg for DTMF. ~Avinash
https://community.cisco.com/t5/ip-telephony-and-phones/dtmf-issue-on-sip/td-p/2850632
May 31, 2016 · Solved: Hello guys, We have a problem with DTMF relay on outbound calls to the PSTN on a SIP Trunk. Users are trying to call a conference number and pressing the DTMF digits but it's not accepting the digits. All phones are 8851 SIP phones. Here's
https://www.cisco.com/c/en/us/support/docs/unified-communications/unified-border-element/200412-DTMF-Relay-and-Interworking-on-CUBE.html
Mar 15, 2017 · On CUBE, configure both sip-kpml and rtp-nte as DTMF relay methods under SIP dial peers. This configuration enables DTMF exchange with all types of endpoints, including those that support only NTE and those that support only OOB methods, without the need for MTP resources. With this configuration, the gateway negotiates both NTE and KPML with CUCM.
https://quickview.cloudapps.cisco.com/quickview/bug/CSCuc80321
Feb 25, 2019 · Webex bridge. DTMF works fine when we use other phones eg. 7961. ANALYSIS: 7936 supports only OOB and since SIP Trunk uses RFC 2833, MTP would be needed for dtmf conversion. However here in, we use early offer and hence MTP gets invoked based on CUCM requirements. 7936 doesn't support getport() too.
https://ucpros.net/cisco-sip-gateway-configuration/
Cisco SIP Gateway: DTMF. In the SIP Trunk: DTMF Signaling Method, we’ve configured no preference, using this method CUCM will try to minimize the usage of MTP while trying to select mutually supported codec. Roughly, there are two preferred SIP DTMF methods that are widely supported by Cisco devices. Out-of-band (OOB): Sent in the signaling path.
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube/configuration/cube-book/dtmf-relay.html
Nov 22, 2019 · Dual-tone multi-frequency (DTMF) relay is the mechanism for sending DTMF digits over IP. ... If an endpoint does not support any of the DTMF relay mechanism configured on CUBE, an MTP or transcoder is required. ... Device# show sip-ua history dtmf-relay kpml Total SIP call legs:2, User Agent Client:1, ...
https://quickview.cloudapps.cisco.com/quickview/bug/CSCut27483
Oct 22, 2019 · Endpoint support for unsolicited notify dtmf is not removed correctly by sme,which results in transition from kpml->unsolicited notify by sme when the leaf node has broken media Symptom: Symptoms:- SIP KPML DTMF not working, UCM is not forwarding the digits to CUC for cross-server login. SME cluster not subscribing for kpml, even leaf included KPML in the sip messages.
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