This guide shows ten common enterprise use cases for Sonic-3.5 (TTS), Ink-2 (STT), and Line (voice agent framework), that we are seeing deployed in industry today.

The first three use cases are Cartesia model-only, via the API. Use cases four through nine use Cartesia's Line agents SDK. The tenth pairs Cartesia voices with digital avatars.

Get the code

All ten examples live in this repo — clone it to follow along. See Setup below for prerequisites.

Table of Contents

• 1. Domain-Specific Dictation and Notes
• 2. Multilingual Training and Practice
• 3. Voice Feedback Surveys
• 4. Inbound Support Triage
• 5. Healthcare Appointment Booking
• 6. Banking KYC Follow-Up
• 7. Sales Role-Play and Coaching
• 8. Sales Qualification
• 9. Internal HR Helpdesk
• 10. Voice for Digital Avatars
• Setup For All Use Cases
• What next

1. Domain-Specific Dictation and Notes

What you're building

Dictation tool for jargon-heavy workflows — field reports, clinical notes, legal transcripts, support summaries. Ink-2 turns your spoken words into text, with industry terms intact.