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Cisco Bug: CSCvs26838 - UCM "Help" documentation for SIP trunk, clarify Note for DTMF setting

Last Modified

Jun 04, 2020

Products (1)

  • Cisco Unified Communications Manager (CallManager)

Known Affected Releases

10.5(2.21900.13) 11.5(1.17000.100) 12.5(1.12900.104)

Description (partial)

Symptom:
Current description for "DTMF Signaling Method":
==
"No Preference (default)—Cisco Unified Communications Manager will pick the DTMF method to negotiate DTMF, so the call does not require an MTP. If Cisco Unified Communications Manager has no choice but to allocate an MTP (if the Media Termination Point Required check box is checked), SIP trunk will negotiate DTMF to RFC2833.
...
OOB and RFC 2833—Choose this configuration if both out of band and RFC2833 should be used for DTMF.
Note   	
If the peer endpoint supports both out of band and RFC2833, Cisco Unified Communications Manager will negotiate both out-of-band and RFC2833 DTMF methods. As a result, two DTMF events would get sent for the same DTMF keypress (one out of band and the other, RFC2833)." 
==
"Note" in fact refers to both No pref and "OOB and RFC 2833" options, but it's unclear as it's right under "OOB and RFC" and looks like explains only this setting, so note needs clarification as below:

"NOTE: If the peer endpoint supports both out of band and RFC2833, Unified Communications Manager will negotiate both out-of-band and RFC2833 DTMF methods for both 'No Preference' and 'OOB and RFC2833'.
As a result, two DTMF events would get sent for the same DTMF keypress (one out of band and the other, RFC2833).

Conditions:
Any CUCM version 
Go to CM administration -> device -> trunk -> any trunk -> Help -> This page
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