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A stream ID as defined in the StreamedMedia channel type. A numeric event code from the DTMF_Event enum. Start sending a DTMF tone on this stream. Where possible, the tone will continue until StopTone is called. On certain protocols, it may only be possible to send events with a predetermined length. In this case, the implementation may emit a fixed-length tone, and the StopTone method call should return NotAvailable.

The given stream ID was invalid. The requested event is not available on this stream.

A stream ID as defined in the StreamedMedia channel type. Stop sending any DTMF tone which has been started using the StartTone method. If there is no current tone, this method will do nothing.

The given stream ID was invalid. Continuous tones are not supported by this stream.

0 1 2 3 4 5 6 7 8 9 * # A B C D An interface that gives a Channel the ability to send DTMF events over audio streams which have been established using the StreamedMedia channel type. The event codes used are in common with those defined in RFC4733, and are listed in the DTMF_Event enumeration.