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Cisco IP Telephony Network Design Guide
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Chapter 5 Dial Plan Architecture and Configuration
Dial Plan Guidelines and Configuration
Campus and Individual Site Dial Plans
In a campus environment with no multisite IP WAN connectivity, the most
common dial plan considerations are concerned with providing PSTN access.
In Figure 5-7, the following dialing conventions apply:
• For internal dialing: 5 digits
• For all long-distance calls: PSTN access code (9) and 1 + the 10-digit number
• For external, local calls: 9 plus the 7-digit number
This example also provides for gateway redundancy in the event of a gateway or
trunk failure to the PSTN. The PSTN gateways are Cisco IOS gateways using
H.323.
Figure 5-7 A Common Dial Plan for an Isolated Campus
Notice that the dial plan configuration in this model requires only a single route
pattern. The 9.@ signifies that 9 is the local PSTN access code, and the @
signifies the North American dialing plan in this case. The route pattern 9.@ for
PSTN
carrier 2
Gateway 2
V
Route group
Gateway 2
Dialed number
Digit manipulation
(discard access code)
Route list
Local-PSTN
Route pattern
9.@
Digit manipulation
(discard access code)
Route group
Gateway 1
PSTN
carrier 1
Gateway 1
V
2nd
choice
1st
choice
40800
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