What E.164 is
E.164 is the international number format: a plus, the country code and the number with no spaces or brackets, 15 digits at most. For example +79161234567 or +971501234567. SIP trunks, CRMs, messengers, SMS gateways and diallers all understand it, and duplicates are found by plain comparison.
How numbers without a country code are read
- A number with + or 00 is international; the country comes from the code.
- For Russia, a leading 810 is the international prefix and 8 the trunk prefix.
- Other numbers are treated as national for the chosen country: 0501234567 with the UAE selected becomes +971501234567.
- A number that already starts with the country code but no plus (79161234567, 971501234567) is recognised too.
One number in detail: phone lookup. Calls by destination: CDR analyzer.