VOI-8000 User’s Guide
Overview
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Application C: FXS/FXO Extended Combination
Application-C has four possible connections. The C-1 connection is a normal trunk connection
between the CO switch and PBX (identical to connection B-1 in the previous application.) The
C-2 connection is identical to the A-1 connection mentioned in Application A. The C-3
connection connects the PBX and gateway through the internal analogue lines provided by the
PBX (identical to the B-3 connection). The C-4 connection connects the CO switch to the
gateway, in this connection the FXO module is also used (similar to the C-3 connection.).
Of course, the C-2 connection can replace the C-3 connection, but it must then use an FXO
module instead of an FXS module. In this application, the user can benefit from the VoIP
application even when outside the office. With a proper dial plan setting, the user can make a
phone call through a public switch back to the office, the PBX will relay the phone call to the
other end which may be located in another city, state, or even country.
Fax
Telephone
4 FXS lines
IP
Telephone
Telephone
PBX
Telephone
FXO: Up
to 8 lines
Public Switch
Telephone
Fax
Public Switch
Telephone
4 FXO lines
Fax
Telephone
Head quarter
Remote Office/Branch Office
Connection C-1
Connection C-4
Connection C-2
Connection C-3