Polycom CX5500 Administrator's Guide

Polycom CX5500 Unified Conference Station Administrator’s Guide 1.1.0
Polycom, Inc. 169
Specify the threshold between active voices and background voices
site.cfg > voice.vadThresh
Generate Dual Tone Multi-Frequency (DTMF)
Tones
The phone generates dual tone multi-frequency (DTMF) tones in response to user dialing on the dial pad.
Use the parameters in the table Dual Tone Multi-Frequency (DTMF) Tone Generation to set up this
feature. These tones, commonly referred to as touch tones, are transmitted in the real-time transport
protocol (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.
Dual Tone Multi-Frequency (DTMF) Tone Generation
Central Provisioning Server
template > parameter
Specify if DTMF tones should be played through the
speakerphone
sip-interop.cfg > tone.dtmf.chassis.masking
Specify the frequency level of DTMF digits
sip-interop.cfg > tone.dtmf.level
Specify how long the phone should wait between DTMF digits
sip-interop.cfg > tone.dtmf.onTime
Specify how long the phone should play each DTMF tone for
sip-interop.cfg > tone.dtmf.onTime
Enable or disable DTMF encoding in an RTP stream
sip-interop.cfg > tone.dtmf.viaRtp
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 technique 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—or otherwise use—DTMF events received from the remote end of
the call. Use the parameters in the table DTMF Event RTP Payload to set up this feature.
DTMF Event RTP Payload
Central Provisioning Server
template > parameter
Specify if the phone will use RFC 2833 to encode DTMF
sip-interop.cfg > tone.dtmf.rfc2833Control
Specify the phone-event payload encoding in the dynamic range to
be used in SDP offers
sip-interop.cfg > tone.dtmf.rfc2833Payload

Polycom CX5500 Specifications

General

Brand	Polycom
Model	CX5500
Category	Conference System
Language	English