Error 37002: "Calling Is Not Enabled on the WhatsApp Business Number" – Twilio Support

Issue

This article guides users through resolving the error “Calling is not enabled on the business number” (Error 37002) when enabling WhatsApp Business Calling for a WhatsApp sender in Twilio. It covers troubleshooting steps, Meta Business Verification requirements, and the correct workflow for binding a TwiML Application to a WhatsApp sender.

Product

Programmable Voice

Environment

Twilio Console

User Account Permission/Role(s) Required

Twilio Account Owner or Administrator
Access to Meta Business Suite with permissions to manage business verification

Resolution

Verify Country Support
- Ensure your WhatsApp sender’s country is supported for WhatsApp Business Calling. (Ecuador, for example, is supported.)
Check Meta Business Verification Status
- Log in to Meta Business Suite .
- Go to Business Settings > Business Info (or Security Center).
- Confirm your business is fully verified. If not, follow Meta’s verification process.
Check Messaging Tier
- Meta may require your WhatsApp Business Account (WABA) to have a messaging tier of at least 2,000 conversations/day for voice features.
Bind the TwiML Application
- After Meta verification is complete, bind your TwiML Application to the WhatsApp sender:
  - In the Twilio Console:
    Go to Messaging > Senders > WhatsApp Senders > Voice Endpoint Configuration, and select your TwiML Application.
  - Or via API:
    Send a POST request to
    https://messaging.twilio.com/v2/Channels/Senders/{SenderSID}with the payload:

{
 "configuration": {
   "voice_application_sid": "{TwiMLAppSID}"
 }
}

Confirm the configuration persists by checking the sender’s details in the Console or via a GET API request.

Test WhatsApp Business Calling
- Place a test call to verify that WhatsApp Business Calling is enabled and functioning.

Additional Information

If the TwiML Application binding does not persist after Meta verification, double-check that your Meta account is fully verified and at the required messaging tier.
VOICE_CALL_REQUEST templates do not require Meta approval and are immediately usable, but cannot be used to initiate a new WhatsApp conversation window. To request call permission, first send an approved Utility or Marketing template to open the session, then send the VOICE_CALL_REQUEST template.
For more details, see: