Does CME support SIP INFO method for DTMF

[Anukalp S]

Hi.. i have come to know that CME does not support SIP INFO DTMF method. It supports only Notify and RTP-nte with SCCP phones.

CME currently supports this DTMF internetworking for SIP to SCCP calls:

*    SCCP out-of-band-SIP Notify / RFC2833 since 12.4(4)T"

Can you pls confirm on this.

[Nadeem Ahmed · Accepted solution]

Currently CME supports this list of DTMF internetworking for SIP to SIP calls:

*         Notify <---> Notify since 12.4(4)T

*         RFC2833 <---> Notify since 12.4(4)T

*         Notify <---> RFC2833 since 12.4(4)T

*         Inband G711 <---> since 12.4(11)T [Requires Transcoder]

CME currently supports this DTMF internetworking for SIP to SCCP calls:

*         SCCP out-of-band-SIP Notify / RFC2833 since 12.4(4)T

CME currently supports this list of DTMF internetworking for SIP to SIP calls:

*         Notify <---> Notify since 12.4(4)T

*         RFC2833 <---> Notify since 12.4(4)T

*         Notify <---> RFC2833 since 12.4(4)T

*         Inband G711 <---> since 12.4(11)T [Requires Transcoder]

CME currently supports this DTMF internetworking for SIP to SCCP calls:

*         SCCP out-of-band-SIP Notify / RFC2833 since 12.4(4)T

There is DDTS enhancement opened for the same

https://tools.cisco.com/bugsearch/bug/CSCse50733/?reffering_site=dumpcr

Br,

Nadeem

[Vivek Batra]

The SIP INFO Method for DTMF Tone Generation feature is always enabled, and is invoked when a SIP INFO message is received with DTMF relay content. This feature is related to the SIP NOTIFY-Basec Out-of-Band DTMF Relay Support feature, which provides the ability for an application to be notified about DTMF events using SIP NOTIFY messages. Together, the two features provide a mechanism to both send and receive DTMF digits along the signaling path.

http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/sip/configuration/12-4t/Configuring_SIP_DTMF_Features.html#GUID-066261A3-5065-4787-A25B-37553A4A9BA9

I've never faced a situation to use SIP INFO with any of the service provider since RFC2833 is most reliable for that purpose.