Build a simple dial-plan normalization rule that separates user dialing habits from routing format.
Dial-plan normalization Match the habit Identify local, national, trunk-access, extension, or plus-number input. Strip what is not public Remove access prefixes such as 9 or national trunk digits when appropriate. Add global context Add country code and area context to create a routeable public number. Route normalized output Send one consistent target format into trunk selection. London users dial 020 7946 0100, New York users dial 9 1 415 555 0100, and mobile users paste +14155550100. The SIP carrier wants E.164-like plus format. Accept local input, normalize once, route consistently The common trap is building route patterns around every user…
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