NetComm V422 Reference Manual page 20

Example for V422 gateway
Phone1-Phone2 are FXS interfaces and can be directly connected to telephone sets for direct calls.
Line1-Line2 are FXO interfaces and can be connected to PSTN lines to serve as a bridge between the
PSTN and other VoIP telephones. The system also allows a call to be made from a traditional telephone
line to connect with a user behind the V422.
Integrating the V422 with PBX
Phone1-Phone2 are FXS interfaces and can be connected to PBX CO lines; Line1-Line2 are FXO
interfaces and can be connected to a PSTN to act as a bridge between the PSTN and other VoIP
telephones. The system also allows a call to be made from a traditional telephone line to connect with a
user behind the V422.
20 V400 Series VoIP Gateway User Guide
YML832 Rev1