the privilege of inbound calls from this trunk.
)
There may not be any appropriate usergroups to select
initially. One can come back later to revise it, once the
expected usergroups are added.
Caller ID Detection
Select to detect the Caller ID calling from PSTN lines.
Answering by Battery Reversal
Detection
If selected, billable time will count from the call is answered.
)
Please enable this function when Central Office (CO)
site provides battery reversal.
3.2.4.3 Add ISDN PSTN Trunks
1.
Enter settings shown in
2. Click
ADD
to see the newly added ISDN PSTN trunk in the table in the webpage.
For deleting an ISDN PSTN trunk, select a trunk identifier and click
DEL
.
Click
Next
to assign trunks to usergroups.
Table 3-10 Add ISDN PSTN Trunk Settings
Field Description
Trunk Group
ID number of this ISDN trunk group. A valid number ranges
from 1 to 31. It should not overlap with existing Analog
PSTN trunk groups.
Trunk Channels
The
Trunk Channels
is the logical range of the sum of B
and D channels. Each physical ISDN port occupies three
Trunk Ports, two B and one D channels. User only needs to
specify the B channel number here, since D channel is
reserved in the 3
rd
trunk port for each physical ISDN port.
E.g. Assume there are four ISDN ports in the PBX and no
other FXO/FXS modules installed, then one can set each
pair of numbers here, like 1,2 but excluding 3,6,9,12.
)
If a four-port FXO/FXS module is also installed, then
the Trunk Ports here should be numbered from 5 to 16
instead of 1 to 12. Make sure to specify the indices of
ports correctly, or PBX will not start. One can refer to
18
