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Your Line agent needs audio input to work. Choose based on your use case.

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Telephony

Use Cartesia Telephony for managed phone numbers. Cartesia provisions numbers and handles the telephony infrastructure for inbound and outbound use cases. You can also use your own telephony stack by connecting to the Calls API.
Bringing your own phone numbers or CCaaS provider is on the roadmap.

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Web and Mobile Apps

Use the Calls API to stream audio between your application and the agent via WebSocket. 
const ws = new WebSocket(`wss://api.cartesia.ai/agents/stream/${agentId}`);
This option works great for:
  • Web applications with browser microphone access
  • Mobile apps with native audio capture

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Pricing

FeaturePrice per MinuteNotes
Agent Calling$0.06Base rate for all voice agent calls
Telephony (add-on)+$0.014Additional when using managed numbers
Total with Telephony$0.074Combined cost for phone-based calls
View your usage and remaining Voice Agent credits on the Subscription page.