A dial plan is a named set of normalization rules that translate dialed phone numbers by an individual user into an alternate format (typically E.164) for purposes of call authorization and call routing. It consists of one or more rules that define how phone numbers expressed in various formats are translated to an alternate format.
The same dial string may be interpreted and translated differently in different dial plans. As a result, the same dialed number may be translated and routed differently depending on which dial plan is assigned to a given user.
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