Filter
Top Products
Voice and Tone Parameters
The parameters in the following sections control the connection to the local phone (FXS) port on the VoIP
Subsystem. This includes control of both the Subscriber Line Interface Circuit (SLIC) and Subscriber Line
Audio Circuit (SLAC) that together make up the FXS port.
Voice, Tone and DTMF Parameters
The following table lists parameters that control voice and tone signals, transmit and receive levels, and
Dual-Tone Multi-Frequency (DTMF) signaling tone characteristics.
Parameter Description Default
Voice RX Gain (-20 to +10 dB)
Voice receive gain in dB 0
Voice TX Gain (-20 to +10 dB)
Voice transmit gain in dB 0
Tone Gain (-20 to +10 dB)
Tone signal gain in dB (applied to locally
generated tones such as call paging
tones).
0
Tone Max (-20 to 0 dBm)
When two tones of equal amplitude are
added together, the signal level is 3dB
higher than the individual components.
When four tones of equal amplitude are
added together, the signal level is 6dB
higher than the individual components.
This limit prevents inadvertent saturation
and user hearing damage.
-12
DTMF Low Tone Gain (-20 to
-5 dBm)
Low frequency group DTMF tone level in
dBm
-9
DTMF High Tone Gain (-20 to
-5 dBm)
High frequency group DTMF tone level in
dBm
-7
DTMF Tone On Time (ms)
DTMF generation On time (50 to 200 ms) 80
DTMF Tone Off Time (ms)
DTMF generation Off time (50 to 200 ms) 50
DTMF Detect ABCD
DTMF detection enable for ABCD dual
tone pairs
Enabled
DTMF Generate ABCD
DTMF generation enable for ABCD dual
tone pairs
Enabled
DTMF Pad Duration (ms)
DTMF out-of-band On time in
milliseconds (0 to 10,000 ms)
100
DTMF Wait Duration (ms)
DTMF out-of-band Off time in
milliseconds (0 to 10,000 ms)
50
DTMF Playout Min Duration (ms)
DTMF out-of-band minimum on time in
milliseconds (0 to 10,000 ms)
100
Chapter 7: Regionalization 29