Section 4. Dial Plan Implementation

A dial plan determines how calls are routed through a VoIP network. In this section, you will see what a dial plan contains and how to create a dial plan that points outward to the public switched telephone network (PSTN). Having multiple sites can add complexity to a dial plan (for example, because of overlapping number ranges). This section also covers potential solutions for such design challenges.

Introducing Call Routing

A numbering plan is a component of a dial plan. Specifically, one of the functions of a dial plan described earlier was the addressing of endpoints. The numbering plan describes the strategy used to assign those addresses. Numbering plans should be scalable, logical, and comprehensive. ...

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