Prerequisites for WhatsApp calling
Before you can use WhatsApp calling, the following must be true:
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The business phone number that you call from must belong to a WhatsApp Business Account (WABA) that is linked to your AWS account. For more information about linking a WABA, see Setup WhatsApp.
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Your business must meet Meta's eligibility requirements for the WhatsApp calling APIs.
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A user must grant your business permission before you can call them. For more information, see Check calling permission for a user.