Cisco Bug: CSCuo57486 - DTMF interworking doesn't work when UnSol NOTIFY OOB and 2833 are used
Jul 03, 2017
- Cisco Unified Communications Manager (CallManager)
Known Affected Releases
Symptom: DTMF Interworking does not work for certain call flows via UCM. Conditions: 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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Bug Details Include
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