Imported Numbers

You can import non-Sinch numbers and enable them for use with Sinch SMS messaging services. For most numbers, the following process outlines the necessary steps:

1. Add numbers using the Create Batch request.
2. Verify ownership of the numbers. This can be done in either the of the following ways:
   • Request a voice call to the number and return the OTP code.
   • Email invoices which prove you own the numbers to orders@sinch.com.

     Note:

     Ensure the invoices you provide explicitly list the numbers you wish to import.

3. Text enable the qualified numbers. Note that only numbers which have been qualified can be text enabled. The text enablement request will generate a Letter of Authorization (LOA) which will be emailed to the email address you provided in the request. You must e-sign the LOA to text enable the numbers.
4. Once the numbers have been text enabled, they are imported numbers and can be be provisioned to SMS plans, linked to campaigns, and used for SMS traffic.

If you have a phone number with a NetNumber ID already provisioned for Sinch, you can import numbers directly and start assigning them to SMS service plans and campaigns.

Manage in the Dashboard

You can also manage imported and hosted numbers in the Sinch Customer Dashboard. The following articles are available:

• Importing Numbers
• Hosting SMS Numbers for US and Canada
• Managing your Hosted Numbers

IP addresses for callbacks

To successfully use callbacks with Imported and Hosted Numbers, add the following IP addresses to your allowlist:

• 54.76.19.159
• 54.78.194.39
• 54.155.83.128