37006: WhatsApp Voice: Max business-initiated calls to this number in 24 hours reached

This error occurs when you attempt more than five connected business-initiated WhatsApp calls to the same number in a 24-hour period. Outbound WhatsApp calling requires call permission from the consumer, and once permission is granted you can place five calls per 24 hours for up to seven days before you must request permission again.

• You already completed more than five connected business-initiated calls to the same number in the past 24 hours.
• Your application kept placing or retrying outbound calls to the same user after permission was granted, which used the five-call allowance for that 24-hour period.

• Wait until the rolling 24-hour window has passed, then place the call again.
• Reduce the frequency of business-initiated calls to the same number.
• Track connected calls per destination number in your application and stop new attempts before you reach the five-call limit. This follows from the WhatsApp Business Calling restriction for business-initiated calls.
• If the current permission window has expired after seven days, or if permission has been revoked, send a new VOICE_CALL_REQUEST permission request before placing another business-initiated call.

• WhatsApp Business Calling
• Call resource API
• Overview of the WhatsApp Business Platform with Twilio