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.
