The 12 best AI telephone platforms in 2027

Compare 12 AI telephone platforms for answering and placing calls. See what each one fits in 2027, from small teams to contact centers.

An AI telephone connects a conversational agent to the phone network. It can answer incoming calls or place calls from software.

This guide compares 12 AI telephone platforms for your 2027 plans. Read the AI phone agent guide for more background.

How does an AI telephone answering service work?

A phone number routes the call to an agent. The agent listens, follows its instructions, speaks, and uses allowed tools.

Your business workflow remains separate from that conversation. A caller can request a booking without the booking system having accepted it.

Phone network receives the call
Your number routes to a saved agent
Agent listens, decides, and speaks
- Allowed action
- Human handover
- Message taken
Call outcome reaches your application
Your application verifies the business result

This is different from a fixed Interactive Voice Response menu. Callers can explain their request in their own words.

For a menu-focused comparison, use the Interactive Voice Response provider guide.

Twelve AI telephone platforms to compare

Compare the platforms against the calls you need to handle.

Platform	Best fit	How it works	Question for your evaluation
Hail	Calls, texts, and email with shared context	Console, MCP, or API; numbers in 120+ countries	Which business tasks should the agent handle?
Bland	Teams evaluating an enterprise phone-agent platform	Agent building, observation, testing, and business workflows	How does it fit your integrations and operating requirements?
Vapi	Developers building voice assistants	Dashboard or API setup, phone numbers, inbound and outbound calls	Which number and assistant configuration fits your call direction?
Retell AI	Teams operating configurable phone workflows	Voice agents, call transfer, and post-call analysis	How will you evaluate failures and transfers?
Synthflow	Teams designing visual phone workflows	Visual Flow Designer and agent evaluation tools	Who will maintain the flow and connected APIs?
ElevenLabs Agents	Teams evaluating conversational agents across channels	Agent configuration, deployment, and monitoring	Which phone connection and tools fit your deployment?
PolyAI	Large contact centers	Vendor builds and runs agents across voice and chat	Who builds and maintains the agent after launch?
Goodcall	Small local businesses	No-code agent answers, books, and transfers calls	Does the handoff reach my staff correctly?
Smith.ai	Law firms and client intake	AI answers, live agents take complex calls	Which calls reach a human, and when?
Rosie	Solo owners and small shops	Learns your site, answers, books, and transfers	Does my plan include live transfers?
Fin Voice	Customer support teams	Agent uses your systems, then hands off to humans	Which actions can it take without a human?
Cognigy	Large enterprise contact centers	AI voice agents on a phone gateway	Confirm fit with your contact center platform

Vendor details were checked in November 2026. Plans change, so confirm each one on the vendor page.

1. Hail: phone agents for calls, texts, and email

Hail gives AI agents a phone number and an email inbox. One agent can answer calls and texts, place calls, answer email, and hand callers to a person.

Full context. The agent remembers earlier phone calls, SMS, and email with the same person, so they never repeat themselves.
Set up your way. Use the console, MCP, or the API. With MCP, an AI assistant can get a number in any supported country, finish the legal verification paperwork, and set up the agent.
Numbers in 120+ countries. Work with local numbers around the world.

Best for: teams that want phone agents with full conversation context across calls, SMS, and email.

See voice, pricing, and Hail vs Vapi.

See how to set up an AI telephone with Hail

2. Bland: an enterprise phone-agent option

Bland describes tools for building, observing, and testing phone agents. Its use cases include scheduling, overflow answering, and data collection.

Best for: teams evaluating a phone-agent platform for structured business workflows.

Test your own requirements before you accept performance claims.

3. Vapi: assistant and phone-number configuration

Vapi's quickstart covers assistant creation, number setup, inbound calling, and outbound calling. It supports dashboard and programmatic setup.

Best for: developers who want to configure voice assistants and telephony through a dedicated voice platform.

Check number requirements separately for inbound and outbound calls.

4. Retell AI

Retell combines voice-agent setup with call-transfer and post-call analysis tools.

Best for: teams that want to build and monitor phone workflows in one platform.

Evaluate one inbound case, one transfer, and one failed business-system request.

5. Synthflow

Synthflow offers a visual Flow Designer for phone agents, with evaluation and monitoring tools.

Best for: teams that prefer a visual flow for structured call handling.

Check how the flow recovers when an API fails or the caller changes their request.

6. ElevenLabs Agents

ElevenLabs Agents provides conversational agent configuration, deployment, and monitoring across communication channels.

Best for: teams evaluating voice-agent behavior alongside broader conversational workflows.

Test the phone connection, tool results, and human fallback for your exact use case.

7. PolyAI

PolyAI builds voice agents for large enterprise customer service. Its page says agents also run on SMS, WhatsApp, web chat, email, and in-app voice.

Best for: large companies with high call volume.

Ask how a project starts, who builds the agent, and what your team must provide.

8. Goodcall

Goodcall is an AI answering service for small businesses. Its agent answers calls, captures lead details, checks a calendar, books appointments, and hands off to a person when needed.

Best for: small businesses that need an AI receptionist.

Make test calls with your own services and hours, then confirm how the handoff to your phone works.

9. Smith.ai

Smith.ai offers AI, human, and hybrid receptionist services, mainly for law firms. Its page says live agents take complex or urgent calls and can transfer them with context.

Best for: law firms that want a person on hard calls.

Confirm which call types go to a live agent and whether outbound calls are included in your plan.

10. Rosie

Rosie is an AI call answering service for small businesses. Its page says it takes messages, filters spam calls, books appointments, and transfers calls to your team.

Best for: solo owners who miss calls after hours.

Call Rosie before you forward your line, and confirm that the transfer options you need are in your plan.

11. Fin Voice (by Intercom)

Fin Voice is an AI voice agent for phone support. Its page says it connects to your systems through APIs to check orders, process refunds, and book appointments, and it passes calls to a human with context.

Best for: support teams that want phone help after hours.

Test a refund or account change in the sandbox, and confirm your phone provider works with it.

12. Cognigy

Cognigy makes AI agents for customer service in large contact centers. It offers voice agents, with a voice gateway for the phone channel, plus chat and messaging.

Best for: large contact centers.

Confirm it works with your current contact center platform and phone setup before you plan a rollout.

Set up an AI telephone yourself

Want to build one? These guides show each step:

Test before changing a real phone workflow

Inbound and outbound calls use the expected greeting.
The caller can interrupt and correct information.
A silent caller does not keep the call open indefinitely.
Unanswered calls have a clear recovery path.
Transfers cannot route back into the same agent.
Duplicate events cannot create duplicate tasks.
Missing details appear as unresolved work.
A staff member can find the transcript and call outcome.

Choose your provider using these results and current costs. Compare number rental, minutes, recording, transfers, and follow-up messages.

See Hail pricing for current rates. Do not compare a single minute rate without the other charges.

AI telephone FAQ

Does this need a special desk phone?

No. The workflow uses a phone number connected to an agent. Callers use their usual phones.

Can it receive and place calls?

Yes. Many platforms handle inbound and outbound calls. Test each direction separately.

Can it replace my whole business phone system?

No. This example covers an agent and call workflows. Check separate needs such as employee extensions, desk phones, and internal calling.

Can I build it without writing API requests?

Sometimes. Some platforms offer templates and visual builders. Hail's setup guide shows one no-code path.

Can I use the call result for office follow-up?

Yes. Most platforms send call events you can use. The AI secretary guide covers tools for follow-up.