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Ultravox can power AI agents that automatically answer incoming phone calls from your users. This is perfect for customer service, support lines, or any application where users initiate contact.

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How Inbound Calls Work

1

User Dials You

User dials your phone number purchased from your telephony provider.
2

Incoming Webhook

Provider routes the call to your configured webhook/application.
3

Create Ultravox Call

Your server creates an Ultravox call and gets a joinUrl.
4

Connect & Answer

Connect the call to your provider using the joinUrl. The AI agent answers and begins the conversation.

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Using Template Variables

When you use Agents for creating calls, you can define template variables that get passed in a call creation time. For incoming calls, this data might come from an IVR or your own application.
Example: Template Context
// System prompt expects template variables
systemPrompt: "You are calling {{customerName}}..."

// Set templateContext at call creation time
templateContext: {
  customerName: "VIP Customer",
  accountType: "enterprise"
}
For more see Template Context →

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Next Steps