Grandstream Networks UCM6102 User Manual page 150

DAHDI Out Line Selection
Tone Settings
Busy Detection
Busy Tone Count
Congestion Detection
Congestion Count
Tone Country
Busy Tone
Firmware Version 1.0.9.26
This is to implement analog trunk outbound line selection strategy. Three
options are available:

Ascend
When the call goes out from this analog trunk, it will always try to use
the first idle FXO port. The port order that the call will use to go out
would be port 1->port 2->port 10->port 16. Every time it will start with
port 1 (if it's idle).

Poll
When the call goes out from this analog trunk, it will use the port that
is not used last time. And it will always use the port in the order of port
1->2->10->16->1->2->10->16->1->2->10->16..., following the last
port being used.

Descend
When the call goes out from this analog trunk, it will always try to use
the last idle FXO port. The port order that the call will use to go out
would be port 16->port 10->port 2->port 1. Every time it will start with
port 16 (if it's idle).
The default setting is "Ascend" mode.
Busy Detection is used to detect far end hangup or for detecting busy
signal. The default setting is "Yes".
If "Busy Detection" is enabled, users can specify the number of busy
tones to be played before hanging up. The default setting is 2. Better
results might be achieved if set to 4, 6 or even 8. Please note that the
higher the number is, the more time is needed to hangup the channel.
However, this might lower the probability to get random hangup.
Congestion detection is used to detect far end congestion signal. The
default setting is "Yes".
If "Congestion Detection" is enabled, users can specify the number of
congestion tones to wait for. The default setting is 2.
Select the country for tone settings. If "Custom" is selected, users could
manually configure the values for Busy Tone and Congestion Tone. The
default setting is "United States of America (USA)".
Syntax:
f1=val[@level][,f2=val[@level]],c=on1/off1[-on2/off2[-on3/off3]];
Frequencies are in Hz and cadence on and off are in ms.
Frequencies Range: [0, 4000)
Busy Level Range: (-300, 0)
UCM6100 Series IP PBX User Manual Page 149 of 305