Build and manage ElevenLabs Conversational AI voice agents with Twilio phone integration. Use when creating AI phone agents (cold callers, appointment setters, customer service), configuring voice/LLM settings, connecting Twilio phone numbers, or debugging voice agent issues. Covers NEPQ sales framework, objection handling, and call qualification flows.
Build AI phone agents using ElevenLabs Conversational AI API + Twilio.
| Setting | Value | Why |
|---|---|---|
| TTS Model | v3 conversational | Best quality for phone calls |
| Expressive mode | ON | Natural inflection |
| Stability | 0.45 | Natural variation without inconsistency |
| Similarity | 0.75 | Recognizable voice |
| Speed | 1.2x | Fast enough for cold calls (API max) |
| Streaming latency | 4 |
| Balance speed vs quality |
| Turn timeout | 2s | Don't wait too long for response |
| Eagerness | eager | Jump in naturally |
| Speculative turn | ON | Faster responses |
| Cascade timeout | 3s | Handle pauses |
kdmDKE6EkgrWrrykO9Qt): Pleasant female, great for cold callsOYTbf65OHHFELVut7v2H): Warm female backupUse gpt-4o-mini for phone agents — speed is critical, latency kills calls.
POST https://api.elevenlabs.io/v1/convai/agents/create
PATCH https://api.elevenlabs.io/v1/convai/agents/{agent_id}
GET https://api.elevenlabs.io/v1/convai/agents/{agent_id}
POST https://api.elevenlabs.io/v1/convai/twilio/phone-numbers — Connect Twilio number
Enable these tools on the agent: voicemail_detection, end_call, background_voice_detection
For appointment-setting agents, use Neuro-Emotional Persuasion Questioning: