Infrastructure

Built for the conversations your business depends on.

AI Models

Choose the right model for the job.

Model agnostic: Choose from supported language, voice, and transcription models. Use telli-managed access, or bring your own model API keys on request.
Natural voice at the core: Full-duplex voice models let agents listen and speak at the same time, while a separate model handles deeper reasoning.
Control the economics: Evaluate models against your own scenarios. Compare the quality of the result, response speed, and usage cost before switching.
Keep your intelligence: Your knowledge, customer context, and workflows stay in the platform as you adopt new supported models.

API & Developers

Build with your tools. Run on telli.

Build through APIs: Manage contacts, schedule calls, retrieve results, and work with phone numbers directly from your software.
Connect the next action: Use webhooks to send call events and outcomes to your systems, keeping your processes connected.
Work through AI tools: Connect Claude, ChatGPT, Codex, and other compatible tools to Charlie through MCP, with your account permissions.

Explore API & Developers

REST API

Webhooks

MCP

POST /v1/callscall.completedtelli.schedule_callcontact.updatedGET /v1/calls/{id}appointment_bookedPOST /v1/callscall.completedtelli.schedule_callcontact.updatedGET /v1/calls/{id}appointment_booked

telli.get_resultssms.deliveredPOST /v1/contactscall.transferredPATCH /v1/phone-numbers/{id}voicemail.receivedtelli.get_resultssms.deliveredPOST /v1/contactscall.transferredPATCH /v1/phone-numbers/{id}voicemail.received

Conversation Infrastructure

Give every conversation the infrastructure it deserves.

Optimized for cost and latency: Keep conversations responsive and running costs under control as your volume grows.
Telephony and messaging together: Manage phone numbers, incoming and outgoing calls, SMS, and WhatsApp connections in one platform. Keep your existing phone setup through SIP or call forwarding.
Built for everyday operations: Configure routing, callbacks, voicemail handling, and warm transfers. Plan the capacity your rollout needs with our team.

Trust & Security

Bring AI into your business on your terms

Manage access: Assign team roles, manage API credentials, and control which tools are connected to your account.
Control customer data: Configure recording, transcript storage, and retention settings for your deployment, with deletion controls for customer information.
Choose your deployment: Run in telli’s cloud, with deployment in your own infrastructure available on request. Our team supports your hosting, privacy, and compliance review with documentation in the Trust Center.

Explore Trust & Security