E.164 Number Format

Definition

The international telephone-numbering format combining a country code and national number.

How it works

The number combines a country code with a national significant number; the plus sign indicates international notation, not a digit. Telephone numbering depends on national rules, carrier capabilities and the selected calling route. Customers benefit from consistent dialling formats and reliable number reachability.

Business example

A CRM stores international phone numbers consistently so dialling and messaging systems can interpret them.

What to consider

Before deployment, verify geographical availability, permitted number formats, tariffs, caller-ID restrictions and both inbound and outbound calling behaviour.

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