IP PABX 3CXPhone System

Description

3CXPhone System is a software based PBX that works with SIP standard based IP Phones, SIP Trunks and VoIP Gateways to provide a complete PBX solution without the inflated cost and management headaches of an old style PBX. The IP PBX supports all traditional PBX features but also includes many new mobility and productivity features. An IP PBX is also referred to as a VoIP Phone System or SIP Server.
Calls are sent as data packets over the computer data network instead of the traditional phone network. Phones share the network with computers so no separate phone wiring is required. With the use of a VoIP/PSTN gateway, you can connect existing phone lines to the IP PBX to make and receive phone calls via a regular PSTN line. You can also use a SIP trunk or VoIP provider, which removes the requirement for a gateway.
A VoIP Phone System generally consists of the IP PBX server (SIP server), one or more SIP based IP phones and a VoIP/PSTN Gateway or a SIP Trunk/VoIP service provider. The SIP IP Phones, being either softphones or hardware based phones, register with the IP PBX server.
When they wish to make a call they ask the IP PBX to establish the connection. The IP PBX has a directory of all phones/users and their corresponding SIP address, and connects an internal call or routes an external call via either a VoIP/PSTN gateway or a VoIP service provider.