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Phone Guides

Numbering

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

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.

Business phone number management: a lifecycle for DIDs and call routes

Manage business phone numbers as operational assets with ownership, purpose, routing, porting records, review and safe retirement.

E.164 number formatting for VoIP and phone systems

Learn how to store, normalise, validate, display, and route telephone numbers using the international E.164 numbering format.

International dialing codes

Understand country codes, E.164 formatting, domestic trunk prefixes, and the checks needed before routing international calls.