Inbound Call Center Software That Answers Every Call in Under a Second

5.0

ON G2

Retell AI answers every inbound call in about 600ms, resolves routine questions on its own, and transfers the rest to a human with the full transcript attached. It runs 24/7 on your existing phone numbers, with no new hardware needed.

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Trusted by over 3,000 businesses powering 30+ million calls per month.

How It Works

Go from build to live inbound calls in a day, on your existing numbers.

Build the agent

Describe the calls your team handles most: order status, appointment changes, billing questions, account lookups. Connect a knowledge base so the agent answers from your current help center and product docs instead of a static script, map your routing rules and the departments a call can reach, and set escalation triggers for the cases a human should own.

Test against real scenarios

Run sample calls against the agent before a single customer reaches it. Throw edge cases at it, frustrated callers, mid-sentence interruptions, accents, background noise, and adjust prompts, routing, and handoff points until the agent matches your real call patterns. Nothing goes live until it clears your own QA bar.

Deploy on your existing line

Point an inbound number or your main line to the agent and it answers on the next call, picking up instantly during peak hours, after close, and on holidays, so callers never hit a queue or voicemail. Start with overflow only, then expand the call types it handles as confidence grows.

Monitor and improve

Every call is transcribed, scored, and tagged by outcome the moment it ends. Watch first-call resolution, transfer rate, and abandonment in one dashboard, use post call analysis to find the questions that still trigger transfers, then close those gaps so performance climbs each week instead of drifting.

Use Cases

Reach the right agent on the first try

The agent routes by caller intent, not menu presses, so billing reaches billing and support reaches support without “press 1.” It matches callers to agents by skill, language, or account tier, connects on the first transfer, and hands the live call to a human with the transcript and caller details attached so nobody repeats themselves.

Answer account questions during the call

The agent pulls order status, balances, and appointment details from your systems mid-call through function calls, answers policy and product questions from your live help center as your docs change, and confirms caller identity and surfaces account history before the agent says a word.

Resolve routine calls without a human

Password resets, order tracking, hours, and FAQs get handled end to end, with no agent required, so the routine volume closes in the conversation instead of queuing.

Book and reschedule appointments on the call

The agent books, reschedules, and cancels appointments during the call with calendar sync, so callers lock in a slot without a transfer to the front desk.

Capture and qualify inbound leads

The agent captures and qualifies new leads on the call, then pushes them to sales with notes attached, so no inbound interest sits in a voicemail box.

Cover peak hours, nights, and overflow

The agent picks up overflow when every agent is busy, answers after-hours and weekend calls at the same quality as business hours, and scales to thousands of simultaneous calls during spikes without adding seats.

Compliance

Regulated call data needs the same security as the rest of your stack, so it comes standard.

SOC 2 Type II

Call data runs on SOC 2 Type II certified infrastructure, meeting enterprise security requirements.

HIPAA

Regulated teams deploy under HIPAA with a self-service BAA portal available from the dashboard.

GDPR

Caller data is processed under GDPR, covering consent and access rights for callers in the EU.

PII Redaction

Personal identifiers are redacted from transcripts automatically, alongside role-based access and configurable data-storage controls.

Feature

Why inbound teams choose Retell AI

Build

Deploy

Monitor

Resolves calls, not tickets

The agent finishes routine requests end to end, the way a strong AI customer support setup should work. Medical Data Systems handles 100% of inbound calls this way, with only a 30% transfer rate to humans. Results vary by setup and call type.

Understands intent, skips the menu

Callers say what they need in plain language instead of pressing numbers. The agent reads intent and routes the call, replacing rigid touch-tone trees with a conversation.

Answers in under a second

An AI voice agent picks up in about 600ms with natural turn-taking, so callers start talking immediately instead of waiting through hold music.

Holds up under peak volume

The platform powers 30M+ calls a month and ships with 20 free concurrent calls, so it absorbs the surge during peak hours and seasonal spikes instead of forcing you to staff for it.

Tracks resolution on every call

Every call is transcribed, scored, and tagged by outcome the moment it ends. Watch first-call resolution, transfer rate, and abandonment in one dashboard, then use post call analysis to find the questions that still trigger transfers and close those gaps.

Integrations

Seamless 
Integrations with Your
Tech Stack

View All Integrations

Hubspot
Twillio
Vonage
Go High Level
8n8
Zapier
Salesforce

Hubspot
Twillio
Vonage
Go High Level
8n8
Zapier
Salesforce

Avaya
Genesys
Five9
Amazon Connect
Telnyx
Make
Cal.com

Avaya
Genesys
Five9
Amazon Connect
Telnyx
Make
Cal.com

Pricing

Cut Costs by 90% with AI phone Agents

Pay as you go

$0 to start.

$0.07–$0.12 per minute – Pay only for what you use.

60 mins of free access.

20 concurrent calls.

10 Free Knowledge Bases.

Get Started

Enterprise Plan

For companies with large volumes, data or deployment requirements, or support needs.

White glove service for your use case.

Premium support with dedicated solution engineer teams.

Custom pricing and concurrent calls based on your needs

Talk To Sales

FAQ

Frequently asked questions.

What is inbound call center software?

Inbound call center software is the system that receives, routes, and helps resolve incoming customer calls. Traditionally it bundles an ACD to queue and distribute calls, an IVR for menu navigation, call recording, and CRM screen pops. AI-based platforms add a voice agent that answers the call directly, reads what the caller wants, and either completes the request or routes it, replacing the press-1 phone tree and cutting the volume that ever reaches a human. The payoff is shorter hold times, higher first-call resolution, and coverage that does not depend on staffing levels.

What is the difference between an inbound and outbound call center?

An inbound call center answers calls customers place to you: support, billing, scheduling, and account questions. An outbound call center places calls to customers for sales, collections, and follow-up. Inbound tools focus on routing, queuing, and resolution, while outbound tools focus on dialing, list management, and lead qualification at scale. Many teams run both from one platform, using the same voice agent to answer inbound calls and to run outbound campaigns.

How does it fit our ACD, CRM, and helpdesk?

It sits on top of your current stack over SIP, so your numbers, carrier, and ACD stay in place. The agent reads and writes account data during the call and logs every interaction to your CRM and helpdesk automatically. No migration is needed to go live.

Will callers know they are talking to AI?

Most do not flag it. The agent uses lifelike voices, about 600ms response latency, and natural turn-taking that handles interruptions and back-channels like “mm-hm.” It books appointments and updates records mid-call, so the conversation stays useful rather than scripted.

What happens when the AI cannot resolve a call?

It escalates. The agent recognizes when a request falls outside its scope, an account flag needs a human, or a caller asks for a person, then performs a warm transfer to the right team with the full transcript, caller identity, and context attached, so the human picks up mid-thread without making the caller start over. If no agent is available, it can take a message, book a callback, or route to voicemail per your rules. Nothing is dropped silently.

What does it cost compared to adding agents?

You pay $0.07 per minute of talk time, not a salary or a per-seat license. A new human agent costs thousands to hire and weeks to train; a new AI agent deploys in days and scales with volume. Cost falls as the agent deflects routine calls from your queue.