Soundwin VoIP Voice Gateway User Manual page 44

FXS Number: The representation number is the phone number of the telephone that is
connected to FXS port.
FXO Number: FXO ports are connected to the extension ports of the PBX system or the
PSTN line. They have a common Line Hunting Group Number. When this number is dialed,
the Gateway system will find a free FXO line connected to PBX. This hunting will skip all busy
lines and absent lines and find only the idle line to the PBX. After the available line is found,
you can hear the dial tone from PBX. After that, you can dial the needed phone number out
through PBX.
(Port number is in comparison with gateway port number. White Port socket is "FXO" port, Black
Port socket is "FXS" port.)
3. Configure the ANI (Answer Number Indication) / Caller ID of the FXS/FXO ports.
ITSP needs ANI for authorization when gateway calls Off-Net call to PSTN number or mobile
phone number.
4. Register to H.323 Gatekeeper
(If user does not have Gatekeeper, Please go to Dialing Plan Policy)
44