Polycom SIP 3.1 - Manual (Page 182)

Administrator’s Guide SoundPoint IP / SoundStation IP
A - 28
Dual Tone Multi-Frequency
This configuration attribute is defined as follows:
Attribute
Permitted
Values
Default Interpretation
tone.dtmf.level -33 to -3 -15 Level of the high frequency component of
the DTMF digit measured in dBm0; the
low frequency tone will be two dB lower.
tone.dtmf.onTime positive
integer 50 When a sequence of DTMF tones is
played out automatically, this is the length
of time in milliseconds the tones will be
generated for; this is also the minimum
time the tone will be played for when
dialing manually (even if key press is
shorter).
tone.dtmf.offTime positive
integer 50 When a sequence of DTMF tones is
played out automatically, this is the length
of time in milliseconds the phone will
pause between digits; this is also the
minimum inter-digit time when dialing
manually.
tone.dtmf.chassis.masking 0, 1 0 If set to 1, DTMF tones will be substituted
with a non-DTMF pacifier tone when
dialing in hands-free mode. This prevents
DTMF digits being broadcast to other
surrounding telephony devices or being
inadvertently transmitted in-band due to
local acoustic echo.
Note: tone.dtmf.chassis.masking should
only be enabled when tone.dtmf.viaRtp is
disabled.
tone.dtmf.stim.pac.offHookOnly 0, 1 0 Not currently used.