Phone Stack

How many calls am I actually missing?

Industry data shows 62% of calls to service businesses go unanswered. If you don't have after-hours coverage, that number is even higher — 35-50% of calls come in outside business hours. Phone Stack answers every one in under a second, 24/7.

What happens when a customer calls my Phone Stack number?

Your AI answers instantly — no hold time, no voicemail. It greets the caller naturally, answers questions using your knowledge base, books appointments on your calendar, sends confirmations via text or email, and routes urgent calls to the right person. The entire interaction is recorded, transcribed, and summarized by AI.

Can callers tell they're talking to AI?

Most can't. Phone Stack uses native speech-to-speech processing — one model handles the entire conversation with ~320ms response time. That's 2x faster than competitors who stitch together separate speech-to-text, AI, and text-to-speech systems. The result is natural conversation speed with no robotic pauses.

What if the AI says something wrong on a call?

Listen Live lets you monitor any active call in real-time. If the conversation needs a human touch, hit Barge In to take over instantly with full context. This is included in every plan — competitors charge $2K+/mo for comparable features.

How long does setup take?

Most businesses go live the same day. Train your AI by chatting with it — describe your business, upload FAQs, set appointment rules. Pick a phone number and you're live. Call +1(855)49-STACK right now to hear what it sounds like.

What's included in the price?

Everything. AI voice agents, telephony, phone numbers, call recording, transcription, SMS, email, CRM integrations, compliance tools, Listen Live & Barge In, and 30+ language support. Other platforms advertise $0.07/min but cost $0.18-$0.31 after stacking LLM, STT, TTS, and telephony fees. Phone Stack starts at $0.18/min with everything included.

Is Phone Stack HIPAA compliant?

Yes. HIPAA-ready and SOC 2-ready infrastructure, TCPA consent tracking, and AES-256 encryption are included in every plan. Enterprise customers get signed BAAs. Dental offices, medical practices, and healthcare organizations use Phone Stack without additional compliance add-ons.

Does it work for outbound calls too?

Yes. Phone Stack handles both inbound and outbound. For outbound: upload contacts, set your campaign goal in plain English, and launch. AI follows up on leads, sends payment reminders, confirms appointments, and qualifies prospects — at scale. Toggle between inbound and outbound views on this page to see both in action.