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https://community.cisco.com/t5/ip-telephony-and-phones/how-to-enable-sip-info-dtmf/td-p/875301
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.
https://wiki.freepbx.org/display/DIMG/SIP+Profile+-+DTMF+Support
Mar 11, 2019 · Dialogic > Profiles > SIP Profile (SGP) > New SIP DTMF Support Max SIP DTMF Support objects. One SIP DTMF Support Object per SIP Profile (SGP) object. Related Topics and Dependencies. The SIP DTMF Support object is utilized when configuring either the SIP Subscribe Notify Method, the SIP INFO Method, or to simply pass DTMF tones.
https://downloads.avaya.com/Libraries/Msg/61/admin/en-US/SIPINFOMessagesOnSIPConnections.html
Support for SIP INFO messages on SIP connections. Messaging supports out-of-band DTMF using the SIP-INFO method. When there is a mix of telephony vendors in the network, the lowest common denominator, that is, the SIP-INFO method is used for passing DTMFs for all telephony vendors to interwork properly.
https://docs.oracle.com/cd/E97662_01/html/sbc_scz820_acliconfiguration/GUID-1A82F27E-F542-40BA-96C8-3125605F598E.htm
RFC 2833 and the SIP INFO method can be used for conveying DTMF information for SIP based-services. (RFC 2833 is the most widely used.) To provide end-to-end DTMF for SIP devices supporting RFC-2833 interworking with H.323 devices that do not, an RFC 2833 to …
https://support.sonus.net/display/SBXDOC62/DTMF+and+RTP+Relay
Dec 14, 2017 · SIP Call Signaling Packets without DTMF INFO Messages: Exchange signaling information for SIP calls. In this case, these packets do not contain any DTMF information, and are conveyed on the SIP Signaling Channel. SIP Call Signaling Packets with DTMF INFO Messages: Exchange all signaling information for SIP calls, including DTMF information.
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/sip/configuration/15-mt/sip-config-15-mt-book/voi-sip-dtmf.html
May 29, 2018 · SIP INFO Method for DTMF Tone Generation SIP NOTIFY-Based Out-of-Band DTMF Relay Support ... The RFC 2833 DTMF MTP Passthrough feature adds support for passing Dual-Tone Multifrequency (DTMF) tones transparently between Session Initiation Protocol (SIP) endpoints that require either transcoding or use of the RSVP Agent feature. ...
https://nickvsnetworking.com/dtmf-over-ip-sip-info-inband-rtp-events/
DTMF over IP – SIP INFO, Inband & RTP Events 26/07/2018 DTMF (Dual Tone Modulated Frequency) aka touch tone, was initially designed to be a faster method of dialling since make-and-break dial pulses were slow and a more efficient method for user input was required switching was becoming digital.
https://www.3cx.com/blog/voip-howto/dtmf-rfc2833/
Delivery to some external party (typically via gateway or provider): These are passed through as received. The external party must support the corresponding delivery mechanism if DTMF strokes are to be recognized. Effectively this means that if DTMF is received with SIP-INFO, it is forwarded also as SIP-INFO.
https://www.voipmechanic.com/dtmf-issues.htm
The choices can then be set for what to send (outbound) and what want to receive (inbound). Only available with SIP channels and is transmitted through a SIP message. Auto- Uses rfc2833 by default, but will switch to inband DTMF tones if the remote side does not indicate support of rfc2833.
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