ITU-T Recommendation E.164 is a global PSTN and data network which arranges telephone numbers to help with call routing. This global framework allows any country to create international phone numbers of up to 15 digits (excluding the international call prefix).
Today, the United Nations handles information and telecommunication technology (ICT) issues through its International Telecommunication Union (ITU). This agency governs the ITU-T, or Telecommunication Standardization Sector, which itself developed E.164 and its related recommendations.
Another player is the World Telecommunication Standardization Assembly (WTSA), which meets every four years to address the most pressing telecommunication problems. E.164 is a set of recommendations the ITU has implemented over several years.
E.164 serves as a successor to E.163. In 1997, it was clear a new numbering method was necessary to accommodate the new age of ISDN.
Compared to the previous framework, E.164 improves dialing, especially for larger companies with offices around the world or anybody who travels cross-border often.
Among the changes is raising the maximum number of digits a telephone number can have from 12 to 15, enabling future growth to support more users.
E.164 is also backward compatible with legacy technologies. Even rotary dial phones can work with the new numbers.
E.164 compliant phone numbers must include the following three fields:
The NDC and SN together make up the national number. Countries have the freedom to decide on the length of the national number if it’s no longer than E.164’s 15-digit limit.
For international public communications, E.164 also dictates the numbering structure for various categories of users, including:
Maintaining compliance with international calling standards is no easy task on your own. Partner with Sinch and leave the complex calling standards to us.
We offer a wide range of internationally-compliant voice solutions, including numbers, number porting, toll-free numbers, and more to support your international calling needs.
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