Chapter 7. Connecting to PBXs
Another useful application of a Cisco voice gateway is to connect to a company PBX. One reason to do this is to eliminate dedicated tie trunks that connect PBX systems in different locations, thus reducing costs by eliminating the monthly charge for those circuits. You can connect a PBX to a voice gateway, and you can route calls across a WAN network to another voice gateway that is connected to the remote PBX. This extends the usefulness of the data bandwidth between sites, and it allows companies to bypass any long-distance tolls that might be charged.
Most companies are either actively investigating or currently involved in replacing their PBX systems with an IP telephony system, such as the Cisco CallManager ...
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