Voice Agents

Phone calls,
perfected.

Inbound, outbound, voicemail, human handoff, calendar booking. BYO SIP or use ours. Sub-400ms p95 latency. 52 languages, code-switching mid-call, emotional tone.

Deploy an agent → Hear a demo call Read the handbook
Live call · Outbound · Acme Clinic Intake p95 · 324ms 00:42 +1 415 555 0119
Agent
Nova · Clinic Intake
Nova
gpt-4o · eleven_v2 · warm
Calling
Sofia Reyes
Sofia Reyes
DOB · 1987-04-22 · Patient
Language
English → Español (mid-call switched)
Sentiment +0.42
Cost $0.017
Interruption 1
Turns 14
Live transcript streaming
Tools used
verify_identity110ms
lookup_calendar88ms
book_slot...
·
send_smsqueued
Knowledge used
📄
clinic-policies.md2 chunks
📄
providers.csv1 row
Next action
Book slot · Dr Patel · Thu 2:30p
Everything a call needs

Built-in, not bolted on.

Inbound & Outbound

Ring-in, ring-out, conferences. BYO SIP (Twilio, Telnyx, Plivo) or use our managed trunks with STIR/SHAKEN branded caller ID.

TELEPHONY

Voicemail drop

Answering machine detection (AMD) with dynamic, personalized voicemail scripts. Leaves context-aware messages, never canned.

AMD · VM

Human handoff

Warm or cold transfer. SIP REFER, conference merge, or dial-out. Full context packet — transcript, intent, CRM fields — passed to the rep.

WARM · COLD · WHISPER

Calendar booking

Native Cal.com, Calendly, Google Calendar, Outlook, Acuity. Reads availability, books, rebooks, cancels — within the call.

5 CALENDARS

Tools & webhooks

Mid-call function calling — REST, GraphQL, MCP. Native CRM, helpdesk, payments. Zero-state or stateful.

MCP · REST · GRAPHQL

SMS follow-up

Send confirmations, payment links, receipts, or opt-in capture mid- and post-call. A2P 10DLC ready.

A2P 10DLC
Bring your own stack

Pick your model.
Swap it any time.

Configure an agent →

LLM

GPT-4o$2.50 / M
Claude Opus 4.6$15 / M
Gemini 2.0 Pro$3 / M
Llama 3.3 70B$0.88 / M
Qwen 2.5 72B$0.90 / M
Your fine-tunebyok

STT (Listen)

Deepgram Nova-3180ms
Whisper large-v3240ms
AssemblyAI Universal210ms
Gladia200ms
Speechmatics260ms
Hertz v3 (own)140ms

TTS (Speak)

ElevenLabs v2140ms
Cartesia Sonic80ms
PlayHT 3.0160ms
Azure Neural220ms
Rime v2110ms
Hertz Voice (own)95ms
The phone, rebuilt.

Ship a call today.
Bill by the minute.