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Lehar agents talk to users over three channels. The same agent configuration (prompt, variables, knowledge base) can drive any of them.

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Web voice

A browser participant connects to a media room and talks to the agent over WebRTC. You create a session, then connect the returned participant_token with a voice client. Best for in-product voice assistants and click-to-talk experiences.

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Outbound phone

The agent dials a recipient over SIP and runs the same conversation loop. Create a session with call_type: "outbound_phone" and a phone_number, or run a voice campaign to place many calls. Requires an outbound SIP trunk on the deployment.

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WhatsApp

Text conversations delivered through WhatsApp (via the messaging provider). Two campaign types use this channel:
  • whatsapp — the agent holds a text conversation with the recipient.
  • whatsapp_voice — sends an approved template, waits for a reply, decides whether the recipient wants a call, and escalates to the outbound voice path when they do.
WhatsApp sends are governed by the 24-hour customer-service window (free-form messages are only allowed within 24h of the last inbound message; outside it, only approved templates). See the WhatsApp guide.

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At a glance

Sessions

Web and phone voice calls.

WhatsApp

Templates, windows, and escalation.