Question

What is the proper destination number format for outbound SMS/Voice traffic?

Applies To

• Outbound SMS
• Number Format
• International Numbers

Answer

The criteria for destination numbers in the E.164 format are as follows:

• No leading +
• No leading 00
• Start with the country code
• Maximum length of an international originator is 15 digits
• No Trunk prefix 0 after the country code

The Vonage API platform does not do this automatically. We send what you input through the API. This means you need to set it up so that the information entered into (or fed out from) your CRM software fits the formatting criteria for sending; whether through UI constraints or stripping it out programmatically.