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Configuring dial plans
More requirements on dial plans arise with the wide application of VoIP. A desired dial plan should be
flexible, reasonable, and operable. Also it should be able to help a voice gateway to manage numbers
in a unified way, making number management more convenient and reasonable.
The dial plan process on the calling side differs from that on the called side. The following discusses these
two dial plan processes, respectively.
Dial plan process
On the calling side
Figure 615 shows the dial plan operation process on the calling side.
Figure 615 Flow chart for dial plan operation process on the calling side
1. The voice gateway on the calling side replaces the calling and called numbers according to the
number substitution rule on the receiving line.
2. The voice gateway performs global number substitution.
3. The gateway selects proper numbers based on the local number or on call route selection priority
rules and replaces the calling and called numbers.
4. The gateway initiates a call to the called side and sends the calling and called numbers.
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