September 2006
Intermediate to advanced
504 pages
11h 49m
English
Content preview from Authorized Self-Study Guide Cisco Voice over IP (CVoice)
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Scalable Dial Plans
The North American telephone network is designed around a ten-digit numbering plan that consists of three-digit area codes and seven-digit telephone numbers, as shown in Figure 5-13. For telephone numbers that are located within an area code, the PSTN often uses a seven-digit dial plan. Features within a CO-based PBX, such as Centrex, allow the use of a custom five-digit dial plan for customers who subscribe to that service. PBXs are more flexible and allow for variable-length dial plans containing 3 to 11 digits.
Figure 5-13. Dial Plan Example
Dial plans contain specific dialing patterns for a user who wants to reach a ...
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