AI Caller Software
Voice Agents That Sound Human
Phone Stack is an AI caller platform: voice agents that place and answer real phone calls in place of human agents. Native speech-to-speech via Gemini Live keeps response latency around 320ms, so conversations sound human with no robotic pauses. AI callers book meetings, qualify leads, leave voicemails, and update your CRM, all on flat monthly plans from $69 per month with talk time included. Start free. 14 days, no card.
Deploy AI callers in minutes. Sub-second voice latency, native-quality speech, and the ability to book meetings, qualify leads, and answer calls 24/7, all on autopilot.
14 days free. No card needed to start.
Or call our live AI caller now:
+1(855)49-STACKWhat is an AI caller?
An AI caller is a voice agent that holds real-time spoken phone conversations with people in place of a human. AI callers handle both inbound and outbound calls, hold multi-turn conversations, take real-world actions (booking meetings, sending emails, updating your CRM), and seamlessly escalate to a human when needed.
Phone Stack AI callers are powered by Google Gemini Live for native voice quality and sub-second response latency, Twilio for telephony, and Anthropic Claude for high-quality reasoning and tool use.
What can an AI caller do?
Outbound prospecting, lead qualification, meeting booking, follow-up sequences.
Inbound tier-1 support: order status, FAQs, account questions, escalation routing.
Appointment booking, rescheduling, reminders, no-show prevention.
NPS, post-call CSAT, market research, voice-of-customer interviews.
Friendly payment reminders, auto-pay setup, hardship escalation.
Appointment reminders, intake screening, medication adherence (HIPAA-eligible add-on on Scale and Enterprise).
Voice quality that fools people
Phone Stack uses Google Gemini 3.1 Live for streaming voice-to-voice, with no separate STT, LLM, and TTS chain. That means:
- Sub-second response latency (typically <600ms first byte)
- Native barge-in: interrupt the AI mid-sentence and it stops
- Natural prosody, pacing, and emotional inflection
- 30+ languages with native-quality voices
- Handles cross-talk, mumbling, accents, and noisy lines gracefully
Built-in compliance
Every AI caller deployment ships with TCPA-aware consent tracking, an internal Do Not Call list that auto-adds anyone who asks to be removed, calling-window enforcement, and recording disclosure controls. You're responsible for scrubbing lists against federal and state DNC registries before uploading. See the legal framework for AI calling and the compliance customer-agreement guide for full details.
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90-day migration plan.
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AI sequences that convert.
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AI Caller FAQs
Common questions about AI callers and voice agents.
Deploy your first AI caller today
15-minute setup. 14 days free, no card. Cancel anytime.