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Voice is a live channel on the platform. An assistant answers an inbound call, speaks, uses the same knowledge and the same tools as it does on WhatsApp, and the conversation lands in the same transcript with channel: "phone".
It is not provisionable through this API. There is no partner route that buys a number, and there will not be one until number procurement is something we can do on a merchant’s behalf in the countries you sell in.

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Why it is not self-serve

A phone number is not a credential a merchant pastes. It is inventory somebody buys, in a specific country, against a regulatory identity.
  • Procurement. Numbers are bought per country from carriers, with stock that runs out and prices that differ by city.
  • KYC. India, the UAE and most of the EU require verified business documents before a number can be assigned, reviewed by the carrier, taking days.
  • Porting. A merchant who wants to keep the number already on their storefront is a manual process with a cutover window.
An API that pretended otherwise would return a 202 and then a support ticket.

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Enabling it for a merchant

Voice is enabled per account rather than sold on a plan. A merchant without it is shown a request form, not an upgrade prompt — there is no tier that grants it, so “upgrade” would send them somewhere that cannot help. Talk to us with the merchant, the country and the expected call volume, and we provision the number and enable the channel on that tenant. Everything after that — the assistant, its knowledge, its tools, and the transcript your CRM reads — is the API you already use.

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What you can do today

An assistant configured through Assistants serves voice as well as chat once the channel is enabled on the tenant. Its conversations appear alongside every other channel in Conversations, with channel: "phone" and no channel.message_id — a call has turns, not message ids.
Voice conversations produce conversation.created and message.received / message.sent for each turn, on the same webhook endpoint as every other channel. Delivery status events are WhatsApp-only; a phone call has no equivalent.