Understanding the E.164 number format

Summary

The E.164 format is an internationally recognized standard for phone numbers, ensuring each device on the Public Switched Telephone Network (PSTN) has a unique, globally identifiable number. Aircall mandates the use of this format to guarantee accurate call routing, seamless integrations, and reliable contact synchronization.

What is the E.164 Format?

E.164 is a numbering standard defined by the International Telecommunication Union (ITU) for the international public telecommunication numbering plan. It specifies that phone numbers should be formatted as follows:

• Structure: + [Country Code][Area Code][Subscriber Number]
• Maximum Length: 15 digits
• No Spaces or Special Characters: The number should not contain spaces, parentheses, or dashes.

For example:

A UK number like 020 1234 5678 becomes +442012345678
A US number like (415) 123-4567 becomes +14151234567

Why it matters

Adhering to the E.164 format is crucial for several reasons:

• Accurate Call Routing: Ensures that calls are directed to the correct international destinations without errors.
• Integration Compatibility: Many integrations, such as CRMs and helpdesks, require E.164 formatted numbers to function correctly.
• Contact Synchronization: Features like Aircall's Contact Sync rely on this format to match calls with the appropriate contacts.
• Avoidance of Errors: Non-compliant number formats can lead to failed calls, duplicate contacts, or missed call logs.

Key features overview

• Global Uniqueness: Each number is unique worldwide, preventing overlaps and ensuring clarity.
• Standardized Format: Uniform structure simplifies number storage, retrieval, and processing across systems.
• Integration Readiness: Compatible with various platforms and services that require standardized number formats.
• Enhanced Deliverability: Reduces the risk of failed calls due to formatting issues.

How to configure 

To format numbers in E.164 within Aircall:

1. Manual Entry:
    

• When adding contacts manually, input the phone number in the E.164 format, ensuring the inclusion of the '+' sign and country code.
   

Example: For a French number 06 12 34 56 78, enter +33612345678.

2. Using Google Sheets:
 

• REGEXREPLACE Function: Removes non-digit characters and appends the country code.
   

Formula: ="+33"&REGEXREPLACE(A1,"\\D","") (for French numbers)

• REPLACE Function: Useful for removing leading zeros or specific prefixes.
   

Example: To remove a leading zero: =REPLACE(A1,1,1,"")

3. Bulk Import:
 

• Ensure all numbers in your CSV or spreadsheet are in E.164 format before importing into Aircall.

FAQs

Q: Can I use spaces or dashes in E.164 formatted numbers?

A: No. E.164 numbers should not contain spaces, dashes, or any special characters. They must be a continuous string starting with a '+' followed by the country code and subscriber number.

Q: What happens if I don't use the E.164 format?

A: Using non-E.164 formats can lead to issues like failed call routing, unsuccessful contact synchronization, and problems with integrations.

Q: Is the E.164 format required for all Aircall features?

A: While some features might function with other formats, it's strongly recommended to use E.164 to ensure full compatibility and optimal performance across all Aircall features and integrations.

Q: How can I convert existing numbers to E.164 format?

A: Utilize tools like Google Sheets with functions like REGEXREPLACE and REPLACE to modify and standardize your contact numbers efficiently.