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VoiceInfra connects to your WhatsApp Business number via SIP trunking, turning it into a fully staffed AI-powered channel. Customers can call your WhatsApp number and hear a natural voice AI response, or send a chat message and receive an instant AI reply — all on the same number they already have saved. No separate phone line required, no hold music, no after-hours voicemail.

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Two Modes: Voice and Chat

VoiceInfra supports two interaction modes on WhatsApp Business, and you can enable both on the same number simultaneously. Voice calls — Customers dial your WhatsApp Business number and your AI agent answers with natural, human-like voice. Handles inbound and outbound calls over SIP trunking. Scales to hundreds of concurrent calls with no hardware. Chat / Messaging — Your AI agent responds to WhatsApp text messages instantly. Qualify leads, answer FAQs, book appointments, and escalate to a human agent when needed — all through WhatsApp chat.

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Pricing

WhatsApp voice calls add 0.035perminute∗∗ontopofVoiceInfra′sstandardplatformfee,bringingtheall−inratetoapproximately∗∗0.035 per minute** on top of VoiceInfra's standard platform fee, bringing the all-in rate to approximately **0.105–0.165perminute∗∗dependingonyourplan.TransferringaWhatsAppcalltoaPBXextensioncosts∗∗0.165 per minute** depending on your plan. Transferring a WhatsApp call to a PBX extension costs **0.50 per transfer.

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WhatsApp to PBX Transfer

One of VoiceInfra’s unique capabilities on WhatsApp is the ability to transfer a live voice call directly to a PBX extension. The workflow looks like this:
  1. A customer calls your WhatsApp Business number
  2. Your AI agent answers, qualifies the caller, and gathers context
  3. When a human agent is needed, the AI transfers the call to the relevant PBX extension
  4. The human agent picks up with full context — no need for the customer to repeat themselves
This bridges your WhatsApp channel and your internal phone system in a single seamless call, making it ideal for sales teams, support desks, and service businesses that use WhatsApp as a customer-facing channel but route complex cases to staff.

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Set Up WhatsApp Integration

1

Connect your WhatsApp Business API account

In the VoiceInfra dashboard, go to Settings → Channels → WhatsApp. Enter your WhatsApp Business API credentials to link your approved Business API account.
2

Configure your AI agent

Choose whether the agent operates in Voice mode, Chat mode, or both. Configure the agent’s persona, knowledge base, and escalation rules to match how your business communicates on WhatsApp.
3

Assign the agent to your WhatsApp number

Select your WhatsApp Business number from the list and assign the configured AI agent. The agent is now active on that number.
4

Test inbound calls and messages

Send a WhatsApp message to your business number and confirm the AI responds correctly. Place a test WhatsApp voice call and verify the AI answers and speaks naturally. Adjust the agent’s configuration as needed.

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Supported Use Cases

  • 24/7 AI receptionist — answer every WhatsApp call and message, day or night, without staffing costs
  • Lead qualification — AI asks qualifying questions, scores intent, and routes hot leads to human agents
  • Appointment booking — AI checks availability and books appointments directly in your calendar integration
  • Customer support — handle FAQs, order status inquiries, and common support requests automatically
  • Outbound follow-up — AI sends proactive WhatsApp messages to follow up on leads or remind customers of appointments
WhatsApp Business API requires an approved WhatsApp Business API account. If you do not have one yet, apply through Meta’s official onboarding process before setting up this integration. Standard consumer WhatsApp accounts cannot be used with VoiceInfra.

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Frequently Asked Questions

No. Your existing WhatsApp Business number handles both messaging and voice calls. Customers use the same number for both channels.
Yes. The AI can transfer a live WhatsApp voice call to any PBX extension. Each transfer costs $0.50. The human agent receives the call with the conversation context already available.
SIP trunking scales to hundreds of simultaneous calls. Your capacity depends on your SIP provider plan and VoiceInfra AI agent allocation.
Yes. Call recording and transcription are available. Recordings and transcripts are stored securely and accessible from your VoiceInfra dashboard.
Yes. SIP trunking uses TLS/SRTP encryption for the voice channel. WhatsApp messages are end-to-end encrypted. Call recordings are stored with role-based access controls.