It’s easy to have your Ultravox agent make outbound calls for appointment reminders, customer outreach, surveys, proactive customer service, or anything else you can dream up.

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How Outbound Calls Work

1

Call Trigger

Your application triggers an outbound call (user action, scheduled event, etc.).
2

Create Ultravox Call

Create an Ultravox call with correct firstSpeakerSetting.
3

Initiate Phone Call

Initiate the phone call using your telephony provider’s API and connect it to Ultravox using the joinUrl. User answers and the agent engages in the conversation.

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firstSpeakerSettings

By default, Ultravox calls assume the agent begins conversations. This is typically what you want for inbound calls (i.e. an agent answering incoming customer support calls). However, outbound calls require modifying this behavior since the user will typically answer the phone with something like “Hello”.
Settings for Outbound Call
{
  "firstSpeakerSettings": { "user": {} }
}

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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.
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