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Cisco Bug: CSCvs26755 - SRND SIP Trunk DTMF "No preference" description incorrect

Last Modified

Dec 18, 2019

Products (1)

  • Cisco Unified Communications Manager (CallManager)

Known Affected Releases

12.5(1.12900.104)

Description (partial)

Symptom:
1) SRND => "Cisco Unified CM Trunks" chapter says:

Link to document: https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/srnd/collab12/collab12/trunks.html

Incorrect part:
"DTMF Signaling Method: No Preference
If both devices support both RFC 2833 In Band DTMF and Out of Band DTMF, then RFC 2833 is preferred."

Should be: "If both devices support both RFC 2833 and any out-of-band DTMF mechanism (UNSOL/KPML), then Unified CM negotiates both RFC 2833 and out-of-band.
As a result, two DTMF events would get sent for the same DTMF keypress (one out of band and the other, RFC2833)."

2) "SIP Trunk MTP Requirements" section:
Doc link: https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/srnd/collab11/collab11/media.html?bookSearch=true#15764

Incorrect:
"If both devices support RFC 2833 and any out-of-band DTMF mechanism, then Unified CM negotiates both RFC 2833 and KPML but relies on RFC 2833 to receive the digits."

Should be:
"If both devices support RFC 2833 and any out-of-band DTMF mechanism, then Unified CM negotiates both RFC 2833 and out-of-band, but the endpoint connected to Trunk may rely on RFC 2833 to receive the digits?.

Conditions:
SRND for any CUCM version
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