A VoIP FXO (Foreign Exchange Office) Gateway bridges the VoIP and PSTN networks by enabling both voice and fax communications.?It offers an FXO interface to a traditional telephone line (PSTN) and an WAN Ethernet port interface to the IP Network.?A connection can be initiated either from a VoIP user to a PSTN user or from a PSTN user to a VoIP user.?It is a key component for building a hybrid communication systems with connections to both VoIP and PSTN networks.?The key advantage is to make use of the IP network and local PSTN networks to save on international / long-distance phone expenses.Advent's VoIP FXO Gateways feature superb audio quality, reliable FXO detection, rich functionalities, and high-level integration.