Chapter 5 – Configuring the Phone Book
Europe
The most direct use of the VOIP system is making calls between the offices where the VOIPs are located. Consider, for example, the Wren Clothing Company. This company has VOIP‐equipped offices in London, Paris, and Amsterdam, each served by its own PBX. VOIP calls between the three offices completely avoid international long‐distance charges. These calls are free. The phonebooks can be set up to allow all Wren Clothing employees to contact each other using 3‐, 4‐, or 5‐digit numbers, as though they were all in the same building.
United Kingdom
Wren Clothing Co.
VOIP/PBX Site 5London
Wren Clothing Co.
VOIP/PBXParis Site 
5
France
Wren Clothing Co.
5VOIP/PBX Site
Amsterdam
The
Netherlands
Free VOIP Calls
In another use of the VOIP system, the local calling area of each VOIP location becomes accessible to all of the VOIP system’s users. As a result, international calls can be made at local calling rates.
For example, suppose that Wren Clothing buys its zippers from The Bluebird Zipper Company in the western part of metropolitan London. In that case, Wren Clothing personnel in both Paris and Amsterdam could call the Bluebird Zipper Company without paying international long‐distance rates. Only London local phone rates would be charged. This applies to calls completed anywhere in London’s local calling area.
Generally, local calling rates apply only within a single area code, and, for all calls outside that area code, national rates apply. There are, however, some European cases where local calling rates extend beyond a single area code. Local rates between Inner and Outer London are one example of this. It is also possible, in some locations, that calls within an area code may be national calls ‐ but this is rare.
United Kingdom
Wren Clothing Co.
Bluebird Zipper Co. VOIP/PBX Site 
London 
5London
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France
Wren Clothing Co.
5 VOIP/PBX Site
Amsterdam
The
Netherlands
Calls at London local rates 
Local Calling Area
MultiVOIP® Voice/Fax over IP Gateways | 99 |
