IG7500 Administration Manual
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Figure 4-24.
Voice – System – Transmission – 2
FXO
: It is used to set many central office line options.
Loop Break Detection Time
: For every PSTN/FXO call, system provides the facility to
monitor the call status. If the remote party hangs up, the ongoing call must be
terminated. The PSTN line monitor is done by the loop-break signal or busy tone. The
value range is: Disable/100/200/… /1000 ms.
Ring Recognition Time
: The timer determines the minimum ring duration recognized
as a valid incoming ring on a FXO port. Shorter ring signals are ignored. The timer
range is 200ms to 600ms in 40ms increments.
Delay Ring Time
: The timer is to allow the Central Office to send ICLID before the call
is answered. Once the timer expires, the programmed extensions will ring and the
ICLID number will be sent to the ringing extensions. The timer range is 3 to 6 seconds
on 0.5 second increments.
Dial Wait Time
: When the user seizes a PSTN/FXO line, the Stable Time delay is
needed to wait the dial tone from Central Office. The timer range is 0 to 8 seconds on 1
second increments.
Inter-digit Timeout
: Its range is from 2 to 9 seconds.
DTMF Signal On/Off Duration
: The on/off time duration of DTMF signal. Their ranges
are from 50 to 200 ms.
Ring Abandon Time
: It specifies the maximum time between valid ring signals from the
CO/PBX. If the duration between rings exceed the Ring Abandon time, IG7500 stops
ringing the destination(s) and the port returns to idle. The timer range is 1 to 10 seconds
on 1 second increments.
Release Guard Time
: The guard time to ignore the noise signal when releasing the call.
The timer range is 1.0 to 3.0 seconds on 0.5 second increments.
Busy Tone Detection Time
: System detects the busy tone to monitor the call status.
When it reaches the detection time, system assumes the remote party hangs up. The
ongoing call will be terminated. When setting the time to “0”, the Busy Tone detection
will be disabled.