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Spectralink 84-Series Series Wireless Telephones Administration Guide
1725-86984-000_P.docx
September 2016
107
Summary
Parameter
Used to:
tone.dtmf.chassis.masking
Specify if DTMF tones should be played through the speakerphone
tone.dtmf.level
Specify the frequency level of DTMF digits
tone.dtmf.offTime
Specify how long the handset should wait between DTMF digits
tone.dtmf.onTime
Specify how long the handset should play each DTMF tone for
Enable or disable DTMF encoding in an RTP stream
Table 8-21: DTMF Tone Parameters
Parameter
Permitted Values
Default
tone.dtmf.chassis.masking
1
0 or 1
0
If 0, DTMF tones will be played through the speakerphone in handsfree mode. If 1 (set only if
tone.dtmf.viaRtp
is set to 0), DTMF tones will be substituted with non-DTMF pacifier tones when dialing in
handsfree mode
– this is to prevent the tones from broadcasting to surrounding telephony devices or being
inadvertently transmitted in-band due to local acoustic echo.
tone.dtmf.level
1
-33 to 3
-15
The level of the high frequency component of the DTMF digit measured in dBm0; the low frequency tone will be
two dB lower.
tone.dtmf.offTime
1
positive integer
50
When a sequence of DTMF tones is played out automatically, this is the length of time in milliseconds the handset
will pause between digits. This is also the minimum inter-digit time when dialing manually.
tone.dtmf.onTime
1
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 played for. This is also the minimum time the tone will be played when dialing manually (even if key press is
shorter).
tone.dtmf.viaRtp
1
0 or 1
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
: If this parameter is set to 0,
tone.dtmf.chassis.masking
should be set to 1.
1
Change causes handset to restart or reboot.
DTMF Event RTP Payload
The handset 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 handset
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 next table to set up this feature.