E.164: writing numbers for international use
Short answer: E.164 is the international numbering framework used to represent a telephone number with its country calling code. A written international contact commonly begins with + and contains no more than 15 digits.
Formatting a number correctly does not prove it is active, assigned or reachable. Use the appropriate national numbering rules when removing a domestic trunk prefix.
Use the definition to check your setup
E.164 is the international numbering framework used to represent a telephone number with its country calling code. A written international contact commonly begins with + and contains no more than 15 digits.
Formatting a number correctly does not prove it is active, assigned or reachable. Use the appropriate national numbering rules when removing a domestic trunk prefix.
Where the CallGlobal line fits
Your number account provides the public telephone identity, its communication controls and the SIP credentials for compatible software. Other capabilities belong to the application or phone system you choose.
Review the live product feature list before relying on an additional function. Number porting, hosted IVR, voicemail, call recording and a public customer API are not included.
Protect the line and the account
- Keep account and SIP passwords private, including in support screenshots.
- Confirm the active rental term before relying on incoming communication.
- Use the complete international number and only an authorized caller identity.
Frequently asked questions
What does this term describe?
E.164 is the international numbering framework used to represent a telephone number with its country calling code. A written international contact commonly begins with + and contains no more than 15 digits.
How does this affect practical configuration?
Formatting a number correctly does not prove it is active, assigned or reachable. Use the appropriate national numbering rules when removing a domestic trunk prefix.
Does every telephone concept name an included product feature?
No. A glossary explains terminology. The product feature page and your number dashboard identify the functions provided with a CallGlobal line.
Continue exploring
- country codes
- phone number formatter
- DID
- mobile number
- caller ID
- verification code not received
- DTMF: carrying keypad choices through a phone call
- IVR: telephone menus and caller-selected routing
Review these country destinations
Sources
- ITU-T: Recommendation E.164, The international public telecommunication numbering plan (as of September 2026)