Research brief

WhatsApp AI Voice Agent: Answer WhatsApp Calls With AI (2026)

The short version

The agent must accept a user-initiated call within about 30 to 60 seconds and start audio at the right moment, or the caller hears silence or misses the first words ².
Only numbers on the Cloud API can take calls, and the business needs a daily messaging limit of at least 2,000 ^1,3.
Of the vendors we read, Gupshup markets voice AI agents on WhatsApp calls; Wati, Respond.io and Twilio describe WhatsApp calling but do not say an AI agent answers ^4,5,8,6.
Retell AI's WhatsApp page is an automation connector for messages, not a voice channel ⁷.
Convocore answers inbound WhatsApp calls only; it does not place outbound WhatsApp calls ⁹.

An AI voice agent for WhatsApp answers the call a customer starts from the chat with your business. This page sets out what an agent has to handle under Meta's rules, what the vendors we read say they offer, and exactly what Convocore does and does not do, as of 5 November 2026.

Sources checked November 5, 2026 · 9 sources · Published by Convocore, which sells white label AI agents. See method and limits.

30 to 60 s

about how long a business has to accept a user-initiated call (Meta)²

2,000

minimum daily messaging limit to enable calling (Meta)^1,3

30 s

longest voicemail timeout Meta allows (0 to 30 seconds)³

60 s

voicemail announcement must be shorter than this³

1 of 4

vendors we read that say an AI agent answers WhatsApp calls (Gupshup)^4,5,8,6

What an AI agent has to do on a WhatsApp call

Meta's rules shape the agent more than the model does. The call arrives as a webhook with an SDP offer and the agent has about 30 to 60 seconds to accept it; if it does not, the caller sees a Not Answered notice ². Meta recommends pre-accepting to connect faster and avoid clipped audio, and says that if media starts too early the caller misses the first words while media that starts too late leaves silence ².

The agent should also end the call properly: Meta asks you to send a terminate request even when the media path signals a hang up ². Audio is Opus by default, with G.711 as an option that needs transcoding ³.

What the voice agent must get right (Meta's documentation)²

Accept in time

About 30 to 60 seconds

Pre-accept

Avoids clipped first words

Speak when media is live

Not too early, not too late

Terminate cleanly

Always send terminate

What you control before the agent picks up

Meta lets you set call hours with up to 2 entries per weekday and up to 20 holiday overrides, and user-initiated calls are unavailable outside those hours ³. Alternatively you can enable voicemail with a timeout of 0 to 30 seconds and an announcement under 60 seconds, but Meta says to turn call hours off when voicemail is on ³.

An AI agent that answers around the clock can leave call hours disabled, in which case Meta treats the business as open 24 hours a day, 7 days a week ³.

Who offers an AI voice agent on WhatsApp calls

We read each vendor's own pages on 5 November 2026. We could not read Vonage or Vapi pages, and a vendor not listed here may still offer it.

AI voice agents on WhatsApp calls, from vendor pages^4,5,8,6,7,9

Vendor	Says an AI agent answers WhatsApp calls?	What the page says
Gupshup	Yes	Voice AI agents answering support calls on phone and WhatsApp, inbound and outbound
Wati	Not stated	Calling plus AI transcription and summaries
Respond.io	Not found	WhatsApp Business Calls in the same thread as chat; its AI agents are described for chat
Twilio	Not stated	Inbound calls go to your Voice application, which you build
Retell AI	No	WhatsApp page is a Zapier-style connector for messages
Convocore	Yes, inbound only	AI agent answers inbound WhatsApp calls; no outbound WhatsApp calls

What Convocore does and does not do

Convocore's AI agent answers inbound WhatsApp voice calls in real time. It is the same agent, knowledge base and tools as the WhatsApp chat, so a customer can ask about opening hours in the chat and call to book. Each call is logged with a transcript in the Calls dashboard. It does not place outbound WhatsApp calls.

To use it, connect the number through the Meta Cloud API and switch calling on for that number in the dashboard's WhatsApp channel settings. Numbers running on the WhatsApp Business app alongside the API do not support calling. Meta's own conditions still apply, including the 2,000 daily messaging limit ^1,3. For the plan that includes voice, see the pricing page ⁹.

Connect WhatsApp to an AI agent How the WhatsApp Calling API works

What the evidence does not show

We did not place a test call on any vendor's service, so what each AI agent does in a live call is untested by us.
Meta's pages we read show no per-minute price for calls, and we do not quote any.
Meta's support page with country restrictions did not load for us.
Convocore's behaviour is described by the company; the pricing page is the only third-party-checkable source here.

Choosing an AI voice agent for WhatsApp

Ask three questions. Does the vendor say on its own pages that an AI agent answers WhatsApp calls? Is it inbound, outbound or both? And what does it charge per minute on top of Meta's fees? If a vendor cannot answer the third in writing, treat the price as unknown.

White label AI platform →Pricing →

Method and limits

Every figure comes from a page opened on 5 November 2026. Where a vendor page was silent we write Not stated or Not found rather than assume.
Convocore sells an AI agent platform and has a commercial interest. If you find an error, write to support@convocore.app.

Sources

WhatsApp Business Calling APIPrimary source
Meta for Developers. Read 5 November 2026; latest changelog entry 23 March 2026.
User-initiated callsPrimary source
Meta for Developers. Read 5 November 2026.
We read the first 39,352 of 47,832 characters; the rest is not used.
Call settingsPrimary source
Meta for Developers. Read 5 November 2026.
We read the first 39,359 of 49,203 characters; the rest is not used.
Voice AI agentsPrimary source
Gupshup. Read 5 November 2026.
Marketing page; no price or Meta requirements shown.
WhatsApp Business Calling APIPrimary source
Wati. Read 5 November 2026.
The page contradicts itself on outbound availability in the US.
WhatsApp Business CallingPrimary source
Twilio. Page modified 6 October 2026; read 5 November 2026.
WhatsApp integrationPrimary source
Retell AI. Read 5 November 2026.
Respond.io home pagePrimary source
Respond.io. Read 5 November 2026.
Convocore pricingPrimary source
Convocore. Read 5 November 2026.

Questions

What is a WhatsApp AI voice agent?

An AI agent that answers voice calls a customer starts from the WhatsApp chat with your business, speaking and listening in real time instead of sending text.

Does Convocore answer WhatsApp calls?

Yes, inbound calls. A customer taps the call button in the chat and the AI agent answers, using the same knowledge base and tools as the chat. Convocore does not place outbound WhatsApp calls.

What do I need to take WhatsApp calls?

A number connected through the Meta Cloud API (numbers on the WhatsApp Business app alongside the API do not support calling), calling switched on for the number, and Meta's conditions such as a daily messaging limit of at least 2,000.

How fast must the agent answer?

Meta gives a business about 30 to 60 seconds to accept a call. After that the caller sees Not Answered.

Which vendors offer AI agents on WhatsApp calls?

On 5 November 2026 Gupshup marketed voice AI agents on WhatsApp, and Convocore answers inbound WhatsApp calls. Wati, Respond.io and Twilio describe WhatsApp calling but did not say an AI agent answers on the pages we read.

Can the AI agent call customers on WhatsApp?

Not with Convocore. It answers inbound WhatsApp calls only. Meta also requires a user's permission before a business calls them.

WhatsApp Calling API guide →WhatsApp AI agent →WhatsApp integration →Best AI receptionist →