2 chord sets on – Polycom Version 1.4.x 17 User Manual

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Administrator Guide - SoundPoint

IP / SoundStation

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4.6.1.3.2 Chord Sets

Chord sets are the building blocks of sound effects that use synthesized rather than
sampled audio (most call progress and ringer sound effects). A chord-set is a multi-
frequency note with an optional on/off cadence. A chord-set can contain up to four
frequency components generated simultaneously, each with its own level.

There are three blocks of chord sets:

• callProg: used for call progress sound effect patterns
• ringer
• misc (miscellaneous)

All three blocks use the same chord set specification format.

tone.dtmf.stim.pac.offHookOnly

0, 1

Not currently used.

tone.dtmf.viaRtp

0, 1

If set to 1, encode DTMF in the
active RTP stream, otherwise,
DTMF may be encoded within the
signaling protocol only when the
protocol offers the option.

Note: tone.dtmf.chassis.masking
should be enabled when
tone.dtmf.viaRtp is disabled.

tone.dtmf.rfc2833Control

0, 1

If set to 1, the phone will indicate a
preference for encoding DTMF via
RFC 2833 format in its Session
Description Protocol (SDP) offers
by showing support for the phone-
event payload type; this does not
affect SDP answers, these will
always honor the DTMF format
present in the offer since the phone
has native support for RFC 2833.

tone.dtmf.rfc2833Payload

96-127

101

The phone-event payload encoding
in the dynamic range to be used in
SDP offers.

Attribute

Permitted
Values

Default

Interpretation