AI Answering Service: How It Works and What It Costs

A live answering service picks up your phone, takes a message and bills you by the minute. An AI answering service picks up the same call for a fraction of the cost, and the good ones book the caller on the right person’s calendar before the call ends.

The quick answer: An AI answering service is a voice agent that answers your business calls when your team can’t, 24/7, instead of a human operator at a call center. Most bill per call rather than per minute, so the same volume costs a fraction of Ruby, AnswerConnect or Smith.ai’s live plans. Carly is the pick if you want bookings instead of messages: it answers your business line, qualifies callers against your rules, books them on your team’s real calendar and texts them a confirmation. Copy one prompt into ChatGPT or Claude, grab a number, and you’re live.

AI answering service vs live answering service: prices side by side

US list prices, checked September 14, 2026.

Human services sell minutes or calls in small blocks, AI services sell calls in big ones. For the full ranking, see the best AI receptionist for small business, or start with what an AI receptionist is.

What an AI answering service actually is

“AI answering service,” “AI phone answering service” and “AI virtual receptionist” all mean a voice agent that answers your business line. What varies is how much it does once the caller starts talking:

1. Live answering service. A trained human answers with your greeting, follows a script and sends you a message. Ruby and AnswerConnect work this way. Smith.ai sells both a human and an AI version.
2. AI message-taker. A voice agent collects name, number and reason for calling and sends you a transcript. Cheaper than a human, but you still call everyone back.
3. AI that qualifies and books. The agent asks your qualifying questions, reads your calendars and books the appointment itself. The note you get the next morning says “booked,” not “please call back.”

Most people searching this term are comparing level 1 to level 2. The money is in level 3, which is where Carly sits.

How a call flows through an AI answering service

Here’s a 6:40pm call about a grinding furnace, on Carly:

1. Your team rings first. During business hours, ring groups ring your people at once or in order. After hours, calls go straight to the AI. Phone menus are optional.
2. Carly answers when nobody picks up, in your company’s name, and in Spanish if the caller speaks Spanish.
3. It answers the easy questions: service area, diagnostic fee, weekend availability.
4. It qualifies against your rules. Emergency? Inside the service area? Under warranty? Your questions, in your order, every time.
5. It books the right person on your team’s real Google or Outlook calendars, round robin.
6. It texts the caller a confirmation from the same business number.
7. It logs everything. Transcript, summary and outcome land in one team inbox and CRM, written back to HubSpot, Salesforce or Dynamics 365.

If the caller texts instead, the same thing happens over SMS (see SMS appointment booking for business).

Message-taker vs an AI that qualifies and books

The callback list is where leads go to die: a caller who hears “someone will get back to you” dials the next company on Google. The lead response agent guide covers the same problem on email.

What an AI answering service costs next to a live one

The billing unit matters more than the headline price. Four are in use:

• Per receptionist minute (Ruby, AnswerConnect). AnswerConnect rounds each interaction up to the next minute, with the first 30 interactions under 30 seconds per cycle not charged.
• Per call (Smith.ai, live and AI). Add-ons are per call too: booking an appointment on a live Smith.ai plan adds $1.50 a call.
• Per call through credits (Quo Sona). One call is 100 credits.
• Per license (RingCentral AI Receptionist), with bundles quoted.

One month for a small service business: 120 answered calls, each billed as 3 minutes (360 minutes).

The AI rows win on price, but an agent that only takes messages still leaves you 120 callbacks. Carly books them instead. Free Zapier-style workflows; AI agents from $35/month.

Buyer’s checklist for an AI answering service

• Does it answer on my existing number? Keeping your number beats sending callers somewhere new.
• Does my team get the first ring? You want routing rules (at once or in order, business hours vs after hours), not AI on every call.
• What exactly is billed? Minutes or calls, whether time rounds up, and whether hang-ups, spam and wrong numbers count.
• Can it read all of my team’s calendars? And book the right person, instead of sending a link.
• Does it qualify against my criteria? Budget, location, urgency, case type: whatever decides whether you want the job.
• What happens after the call? A text to the caller from your business number, and a transcript and summary in your CRM.
• What are the exit terms? Smith.ai’s AI Receptionist asks for 30 days’ notice to cancel. AnswerConnect advertises no contract and no notice period.
• How long does setup take? With Carly, minutes: one prompt in ChatGPT or Claude.

AI answering service options, Carly first

The best AI receptionist list ranks more tools, and best small business phone systems covers the phone line itself.

1. Carly

Carly runs your business line and follows your rules exactly, the same way on every call:

• Answers 24/7, or only when your team doesn’t pick up. Detects Spanish and answers in Spanish.
• Qualifies callers and books them on your team’s real Google and Outlook calendars during the call, round robin.
• Texts from the same number: a text back on every missed call, two-way texts, reminders, group texts.
• Calls new web leads within about a minute of a form fill, and texts and emails if they miss it.
• Hands callers to a person through ring groups or a phone menu.
• Logs every call, transcript, voicemail and text in one team inbox and CRM, written back to HubSpot, Salesforce or Dynamics 365.
• Runs from ChatGPT or Claude with the Carly connector: build the agent, place calls, watch a live call and steer it.
• Connects to thousands of apps, and every call can trigger free Zapier-style workflows.

Best for: Service businesses, agencies and professional firms where a missed call is a lost job. Pricing: Free Zapier-style workflows; AI agents from $35/month. Setup: Copy one prompt into ChatGPT or Claude, grab a number, and you’re live.

Help me connect Carly Teams so I can work with my organization's business texts, phone calls, voicemail and voice/text agents from this chat. I'll add it to you myself: tell me exactly what to click for the app you are, one step at a time, and wait for me to confirm before moving on. If a step doesn't match what I see, ask me what's on my screen. If you can do the setup yourself (Claude Code, Codex, Muse, Grok Bot), go ahead, and ask me for any key in your secure credential prompt, never in the chat. Don't tell me it's connected until list_phone_lines works, and if I have several teams, ask which to use. Before sending a text or making a call, confirm the team, recipient and message or task with me. The steps are below.

# Connect Carly Teams to an AI app

> Carly Teams works a team's business phone lines through the team's AI agents: business texts, phone calls, voicemail, the voice and text agents, and the team's CRM.

MCP server: https://carlyassistant.com/team/mcp (streamable HTTP, OAuth)

## Setup

Carly Teams isn't in any plugin or connector directory yet, so it's added as a custom connection by URL.

1. Add Carly Teams:
   - ChatGPT: open https://chatgpt.com/plugins, click Add, and choose Create MCP App (not Create plugin or Upload plugin archive). If Create MCP App isn't on the menu, turn on Developer mode first in Settings > Security and login. Name it "Carly Teams" with the description "Work with my team's business texts, calls, voicemail and voice/text agents," paste https://carlyassistant.com/team/mcp as the server URL, choose OAuth, create it, and sign in. Then in the message box open the + menu, choose Developer mode, and pick Carly Teams. No plugin needs to be built, packaged or uploaded.
   - Claude (claude.ai, Claude Desktop, or Cowork): Customize > Connectors > Add custom connector, name it Carly Teams, paste https://carlyassistant.com/team/mcp, and sign in.
   - Claude Code: `claude mcp add --transport http --scope user carly-teams https://carlyassistant.com/team/mcp`, then /mcp, pick carly-teams, and authenticate.
   - Codex: `codex mcp add carly-teams --url https://carlyassistant.com/team/mcp`, then `codex mcp login carly-teams`.
   - Cursor: add {"mcpServers": {"carly-teams": {"url": "https://carlyassistant.com/team/mcp"}}} to ~/.cursor/mcp.json, then sign in to carly-teams from Customize.
   - Muse: a custom connector to https://carlyassistant.com/team/mcp with a Carly API key as its bearer token. The key comes from carlyassistant.com/account (API key under Carly Teams) and goes in Muse's connector settings, not in a chat message.
   - Grok: grok.com/connectors > New Connector > Custom, paste https://carlyassistant.com/team/mcp, and sign in.
   - Grok Bot: a custom remote MCP server named carly-teams at https://carlyassistant.com/team/mcp. Approve it and sign in.
   - Perplexity: Plugins in the sidebar (or Customize > Connectors), then Add custom > Connector > Add MCP connector. Choose Remote, name it Carly Teams, paste https://carlyassistant.com/team/mcp, pick OAuth, check the box and click Add, then click the Carly Teams card to sign in.
   - Anything else: a remote MCP server (streamable HTTP) named carly-teams at https://carlyassistant.com/team/mcp. It signs in with OAuth.
   Sign in with the Carly account that belongs to the organization.

2. Once it's added, the Carly Teams tools show up in the chat, including list_phone_lines. If they don't, turn Carly Teams on for the chat or start a new chat.

3. To check it worked, call list_phone_lines: it returns the teams and phone lines the account can reach. A team with no phone line yet can get one with find_numbers (optionally by area code) and get_number, which may return a checkout link to finish.

4. Something to try first: "Review our missed calls and voicemail and help me reply to customers." Carly Teams also reads and answers business texts, has the team's agent make calls, and edits the voice and text agents. Texts and calls go out at once from the agent's number and can't be taken back. Team permissions apply.

## Email, calendars and workflows

Email, calendars, files, booking pages and workflows are the regular Carly connector, added separately. It's listed in ChatGPT's plugin directory (https://chatgpt.com/plugins/plugin_asdk_app_6a67a26316b88191860222f918d4ec54) and Claude's connector directory (https://claude.ai/directory/carly), and connects anywhere else at https://carlyassistant.com/mcp/. Its setup is https://carlyassistant.com/mcp.txt.

Get started, or watch the 2-minute video first.

2. Smith.ai

Smith.ai sells two products: an AI Receptionist and a human-first virtual receptionist service, both billed per call. The AI plans include lead qualification, call routing and scheduling through tools like Calendly.

Best for: Law firms and service businesses that want a human fallback from the same vendor. Pricing: AI Receptionist free for 25 calls a month ($3.00 per call after), Pro from $150/month for 75 calls. Live receptionists from $300/month for 30 calls. Watch out for: Per-call add-ons on the live plans (booking is $1.50 a call). Low-star Trustpilot reviews center on billing, including AI calls escalated to live agents and charges after cancelling.

3. Ruby

Ruby is a live receptionist service answering 24/7, with scheduling, bilingual answering and intake available, and optional AI enhancements at no extra cost.

Best for: Businesses whose callers expect a human voice every time. Pricing: $250/month for 50 minutes, $395 for 100, $720 for 200, $1,725 for 500. Watch out for: Minute billing adds up on long calls, and low-star reviewers report being charged for spam and dropped calls.

4. AnswerConnect

AnswerConnect is a human answering service that sells itself on real people answering, 24 hours a day, 365 days a year, with CRM integrations and a mobile app.

Best for: Higher-volume businesses that want live answering around the clock. Pricing: Quote only. AnswerConnect now shows prices after a sign-up form; its earlier published plans ran from $350/month for 200 minutes to $575 for 400. Watch out for: Every interaction rounds up to the next minute, and extras like Spanish answering and phone-menu routing are paid add-ons.

5. Quo Sona

Sona is the AI agent inside Quo (formerly OpenPhone) that answers calls 24/7. Every Quo plan includes 10 Sona calls a month, and past that you buy credit packs. Our Quo pricing breakdown has the details.

Best for: Small teams already on Quo that want after-hours coverage in the same app. Pricing: Quo from $19/user/month ($15 billed annually). Sona packs run from $25/month for 40 calls to $199/month for 600. Watch out for: Ten included calls go fast, and on the Starter plan AI call summaries and transcripts only cover Sona-handled calls.

6. RingCentral AI Receptionist

RingCentral’s AI Receptionist answers questions, captures lead details, schedules appointments, sends follow-up texts and routes urgent calls. It is sold as an add-on to RingEX or as a standalone license. More in our RingCentral AI Receptionist guide.

Best for: Companies already running their phones on RingCentral. Pricing: Starts at $39. Bundles with other add-ons are quoted by RingCentral’s team. Watch out for: The listed price is a floor, and the package you end up with is a sales quote.

FAQ

What is an AI answering service?

An AI answering service is software that answers your business phone with a voice agent when your team can’t pick up, including after hours. Basic versions take a message and send you a transcript. Better ones answer questions, qualify the caller and book the appointment on your calendar during the call.

How much does an AI answering service cost?

AI plans run from free tiers covering a few dozen calls to a few hundred dollars a month. Smith.ai’s AI Receptionist is $150/month for 75 calls, and RingCentral’s AI Receptionist starts at $39. Live answering costs more for the same volume: Ruby starts at $250/month for 50 minutes and Smith.ai’s live receptionists at $300/month for 30 calls. Carly: Free Zapier-style workflows; AI agents from $35/month.

Is an AI answering service better than a live answering service?

On cost and speed, usually: an AI agent answers instantly, handles several calls at once and costs a fraction of per-minute human answering. A trained human still reads an upset caller better. What works for most small businesses is your team on the first ring and AI on overflow and after hours.

Can an AI answering service book appointments?

Some can, and it’s the feature worth paying for. Look for one that reads your team’s real calendars rather than sending a scheduling link. Carly qualifies the caller, books the right person and texts a confirmation.

Is an AI virtual receptionist the same as an AI answering service?

Yes, in practice. Vendors use both names for a voice agent that answers your business line. Compare what each one does on the call (message, qualify, book), not what it’s called.

Can I keep my existing business number?

Yes. Forward the calls your team misses to Carly, or grab a new local number right in the chat. Smith.ai and Quo also port existing numbers.

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