SolidPBX™ can be deployed to work with an existing PABX system. The appliance can also provide DHCP, NTP and TFTP services to the IP network.

A SolidPBX™ appliance allows the public telephone network and the PABX to communicate with devices registered to it through an FXO gateway. The gateway can also perform trunk-hunting for outgoing calls to the public telephone network. It also allows calls to the SolidPBX™ appliance even when the internet connection is down.

The client devices registered to a SolidPBX™ appliance can include SIP phones registered through public internet or the appliance’s web-based user interface; personal computers registered through the local area network (LAN); and wireless devices registered through SolidPBX™ WiFi access points.

Clients registered to the SolidPBX™ appliance can call each other directly or through the Auto-Attendant feature. Calls to the public telephone network are routed directly with telephone numbers dialed normally.

The diagram shows a SolidPBX™ appliance -- with various devices registered to it -- deployed as a VoIP system alongside an existing PABX system. Calls from the public switched telephone network (PSTN) and the PABX pass through the FXO gateway to and from the SolidPBX™ VoIP deployment. Outgoing calls from the SolidPBX™ VoIP deployment also pass out through the FXO gateway.