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Cisco Bug: CSCuo57486 - DTMF interworking doesn't work when UnSol NOTIFY OOB and 2833 are used

Last Modified

Jul 03, 2017

Products (1)

  • Cisco Unified Communications Manager (CallManager)

Known Affected Releases


Description (partial)

DTMF Interworking does not work for certain call flows via UCM.

DTMF Interworking fails when UCM routes a certain sip call while the SIP trunk DTMF Signaling Method is set to "No Preference"

- Party A has UnSolicited NOTIFY (sip-notify) OOB as well as RFC 2833 Inband DTMF Capabilities
- Party B has only SIP-KPML OOB DTMF Capabilities

Since both sides have a compatible OOB DTMF Relay method UCM should negotiate SIP-NOTIFY to one leg and SIP-KPML on the other and relay DTMF out of band appropriately however this does not happen and DTMF relay fails with this call flow.
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