Polycom Version 1.4.x 17 manual Dtmf Tone Generation, Dtmf Event RTP Payload

Administrator Guide - SoundPoint® IP / SoundStation® IP Features

Local

Web Server	None.
(if enabled)
Local Phone User	None.
Interface

3.3.5 DTMF Tone Generation

The phone generates DTMF tones in response to user dialing on the dial pad. These tones are transmitted in the RTP streams of connected calls. The phone can encode the DTMF tones using the active voice codec or using RFC 2833 compatible encoding. The coding format decision is based on the capabilities of the remote endpoint.

Central	Configuration file:	Set the DTMF tone levels, autodialing on and off times, and
	ipmid.cfg	other parameters.
(boot
		• For more information, see 4.6.1.3.1 Dual Tone Multi-
server)
		Frequency <DTMF/> on page 70.
	Web Server	None.
Local	(if enabled)
	Local Phone User	None.
	Interface

3.3.6 DTMF Event RTP Payload

The phone is compatible with RFC 2833 - RTP Payload for DTMF Digits, Telephony Tones, and Telephony Signals. RFC 2833 describes a standard RTP-compatible tech- nique for conveying DTMF dialing and other telephony events over an RTP media stream. The phone generates RFC 2833 (DTMF only) events but does not regenerate, nor otherwise use, DTMF events received from the remote end of the call.

Central	Configuration file:	Enable or disable RFC 2833 support in SDP offers and spec-
	ipmid.cfg	ify the payload value to use in SDP offers.
(boot
		• For more information, see 4.6.1.3.1 Dual Tone Multi-
server)
		Frequency <DTMF/> on page 70.
	Web Server	None.
Local	(if enabled)
	Local Phone User	None.
	Interface

Copyright © 2004 Polycom, Inc. 43