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The ability of reducing communication cost by
utilizing a SIP enabled IP PBX phone system instead of a traditional
PSTN PBX network is the first advantage people think of when
switching to an IP based PBX phone system. Essentially phone calls
made over an IP network are free.
Typically an IP PBX by-passes the
wholesale charges made by the incumbent telephone company. (AT&T, Verizone, Qwest, SBC, Bell South and Sprint) This by-pass occurs as
the customer is connected to a SIP enabled trunk provider, via an
broadband Internet circuit like a data T1 line, as opposed to
multiple telephone lines to the incumbent phone company’s switch.
The SIP provider will use the Internet to by-pass the long distance
and international charges as long as the distant end party is
connected through a SIP enable connection. For example, an
international call that is placed over an IP PBX will be carried on
the IP network from the point of origin to a break outpoint in a
foreign country.
The SIP provider will incur its capital costs of
the IP infrastructure and only the wholesale charge for the foreign
national leg of the call. Previously, the service provider would
have to pay charges to the local phone company, an international
carrier and the foreign carrier.
The end result is long distance and
international call charges are significantly lower than traditional
phone companies. |
