Configurations
of GSM/VoIP networks allow the service providers to avoid the local Wired
Public Switched Network (PSTN) in communication with a GMS mobile handset. As a
result, the high rates charged by telephone companies are avoided.
Introduction
With a traditional PBX system, or private branch exchange, everything is done over live phone lines. Stations are utilized to route and reroute phone calls in order to allow a caller to reach the party they want to talk to. While this is a perfectly acceptable method of doing business, as technology grows, so do the incentives for upgrading to newer business telephone systems.