There are a number of shared concepts between the Vonage APIs: the use of JSON Web Tokens (JWTs), signed requests, and webhooks. The guides below explain in detail how to use these elements.


Number format

Within the Vonage APIs, all phone numbers are in E.164 format. This means that numbers:

For example, a US number would have the format 14155550101. A UK number would have the format 447700900123.

If you are unsure how to format the number, the Number Insight API can be used to find correct information about a number.

See also Number format in the Voice API documentation.