Telephone numbering and dialing hub

Telephone numbers are identifiers used by people, carriers, routing systems, emergency services, and business applications. Store canonical numbers separately from display formatting.

Core references

[E.164 number formatting](/e164-number-formatting/)

[International dialing codes](/international-dialing-codes/)

[Number portability](/number-portability/)

[VoIP dial plans](/dial-plans/)

[Emergency calling](/emergency-calling-voip/)

Good data practice

Use a consistent canonical format, retain extensions separately, validate against the destination country, and never assume that a syntactically valid number is reachable. Keep caller ID permissions and emergency location data under explicit ownership.