![]() ![]() The attributes of the element are as follows. The format for the representation of DTMF events over XMPP is as follows (see Namespace Versioning regarding the possibility of incrementing the version number): However, XMPP applications MAY support and use the protocol described herein for communicating DTMF information with endpoints that are not RTP-aware, such as gateways to the PSTN. Such applications SHOULD NOT use the protocol described herein for communicating DTMF information with RTP-aware endpoints. XMPP applications that use Jingle (XEP-0166) and the Real-time Transport Protocol ( RFC 3550 ) for voice chat as described in Jingle RTP Sessions (XEP-0167) MUST support and prefer native RTP methods of communicating DTMF information, in particular the "audio/telephone-event" and "audio/tone" media types. ![]() Internet telephony systems also use DTMF tones, usually for interoperability with the PSTN but sometimes also in native Internet services. Traditional telephony systems such as the public switched telephone network (PSTN) use Dual Tone Multi-Frequency (DTMF) events for dialing and to issue commands such as those used in interactive voice response (IVR) applications.
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