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AMA-CUCM Troubleshooting: Best Practices for Reading Trace Files

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Out-of-band DTMF Transport

Hello,

I have recently been struggling with DTMF relay configuration in which the provider has issues with in-band DTMF transport and has requested DTMF's to be delivered out-of-band. Examining the SIP INFO and the SIP NOTIFY methods for out-of-band DTMF delivery, has led to the following predicament.

As per this link

http://www.cisco.com/en/US/docs/ios-xml/ios/voice/sip/configuration/15-mt/voi-sip-dtmf.html#GUID-901BED51-E8B2-4994-AC38-875E8A10D7C9

"NOTIFY-based out-of-band DTMF relay is a Cisco proprietary function."

While on the other hand, looking at another Support Community article at

https://supportforums.cisco.com/community/netpro/collaboration-voice-video/ip-telephony/blog/2013/05/27/understanding-sip-dtmf-options-supported-by-cucm

we have CSCse50733 according to which "CUCM and IOS gateways can receive SIP INFO (RFC 2976) messages for DTMF but cannot generate them"

Does this mean that RFC-based out-of-band DTMF generation is currently not supported at all by Cisco voice gateways?

Kind regards,

Miroslav

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