AI Answering Service
Every Call Answered, 24/7
Phone Stack is an AI answering service: an AI voice agent answers your business line 24/7, holds a real conversation, books appointments on your calendar, takes messages, and routes urgent calls to you. It costs $0.18/minute all-inclusive — roughly a tenth of a human virtual receptionist — sets up with zero code in about 15 minutes, and includes 30 free minutes.
What is an AI answering service?
An AI answering service is a 24/7 phone-answering service that uses an AI voice agent in place of a human receptionist. Calls are answered instantly, the AI holds a real conversation with the caller, books appointments, takes messages, and routes urgent matters to you. Phone Stack is the AI answering service version of legacy virtual receptionist providers — same job, ~10% of the cost, 24/7/365 with no premium.
AI Answering Service vs Virtual Receptionist vs In-House
| Phone Stack AI | Virtual Receptionist | In-House | |
|---|---|---|---|
| Cost per minute | $0.18 | $1.50–$3.00 | $0.75 + benefits |
| 24/7 coverage | Yes | Premium pricing | Shifts |
| Setup time | 15 minutes | Days | Weeks |
| Concurrent capacity | Unlimited | Limited | 1 per receptionist |
| Calendar booking | Yes | Add-on | Manual |
| CRM logging | Yes | Add-on | Manual |
What the AI answering service does on a call
- Answers within one ring, 24/7/365
- Greets callers in your brand voice
- Answers FAQs from your knowledge base
- Books appointments live on Google or Outlook calendar
- Takes messages and emails them to you
- Texts you immediately for hot leads or emergencies
- Transfers live to your mobile when needed
- Logs every call to your CRM with a transcript
Part of the Phone Stack AI call center
The AI answering service is one mode of the broader Phone Stack AI call center — every account also gets outbound campaigns, voicemail drops, and a complete AI caller platform.