Polycom Version 1.4.x 17 - Manual (Page 51)

Administrator Guide - SoundPoint ® IP / SoundStation ® IP Features
Copyright © 2004 Polycom, Inc. 43
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.
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.
Local
Web Server
(if enabled) None.
Local Phone User
Interface None.
Central
(boot
server)
Configuration file:
ipmid.cfg Set the DTMF tone levels, autodialing on and off times, and
other parameters.
• For more information, see 4.6.1.3.1 Dual Tone Multi-
Frequency on page 70.
Local
Web Server
(if enabled) None.
Local Phone User
Interface None.
Central
(boot
server)
Configuration file:
ipmid.cfg Enable or disable RFC 2833 support in SDP offers and spec-
ify the payload value to use in SDP offers.
• For more information, see 4.6.1.3.1 Dual Tone Multi-
Frequency on page 70.
Local
Web Server
(if enabled) None.
Local Phone User
Interface None.