Auto Attendant Phone System That Answers Every Call

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Retell AI turns your auto attendant phone system into an AI receptionist that answers inbound calls, understands what callers need, and routes them to the right team or resolves it live. Works with your existing numbers, 24/7, no engineers required.
Trusted by over 3,000 businesses powering 30+ million calls per month.
How It Works

Launch an auto attendant phone system in four steps, from building your call flow to handling live calls on your own numbers.

Build your call flow
Map your departments, greetings, and routing rules in the drag-and-drop builder using a pre-built template.
Test with simulated calls
Run simulated calls to confirm routing, greetings, and escalation behave correctly before going live.
Connect your numbers
Link your existing phone numbers and carrier over SIP trunking, with no porting delay or new hardware.
Deploy and monitor
Launch the agent and track routing accuracy, call outcomes, and caller sentiment in the analytics dashboard.
Use Cases

Answer Calls After Hours and Weekends

After-hours and weekend calls hit voicemail, and most callers never try again. An AI auto attendant answers every one, routes the urgent ones, and books appointments just like your daytime receptionists. Your team starts the day with a booked calendar instead of a voicemail backlog.

Route Across Departments and Sites

Front desks fumble transfers between departments, sites, and languages. A multi-level AI auto attendant reads why someone is calling, detects their language from 31+ supported, and routes to the right team or branch. Callers reach the right person on the first try, not the third transfer.

Book Appointments During the Call

Callers who want to schedule get put on hold for the front desk, then play phone tag. The agent checks live availability to book appointments during the call, then confirms by text. Scheduling closes on the first call, with no transfer and no callback.

Deflect Routine Questions Up Front

A third of inbound calls are simple questions: hours, location, order status, balance. The agent answers these directly and reserves your team for calls that need judgment, the same way an AI customer support agent deflects routine tickets. Hold times drop because routine calls never enter the queue.

Handle Spikes Without Busy Signals

When call volume spikes, callers hit busy signals or long holds and satisfaction tanks. The auto attendant answers unlimited concurrent calls at once, a core piece of call center automation, so no caller waits because the lines are full. Peak days run on the same headcount as quiet ones.

Run Outbound Reminders and Callbacks

Confirmations, reminders, and callbacks pile up and never get made when the queue is busy. A batch call campaign dials every contact automatically, confirms appointments, and reminds no-shows without tying up an agent. Follow-up that needed dedicated staff now runs on its own.

Compliance

An auto attendant handles caller details on every call, so security is built in.

SOC 2 Type II

Caller and routing data sits on SOC 2 Type II certified infrastructure, ready for security review.

HIPAA

Clinics route patient calls under HIPAA, with a self-service BAA available in the platform.

GDPR

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

PII Redaction

Sensitive details are redacted from transcripts automatically, with retention you set by policy.

Feature

Why businesses choose Retell AI over a basic auto attendant

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
FAQ

Frequently asked questions.

What is an auto attendant phone system?

An auto attendant phone system answers inbound calls and routes them to the right department or voicemail without a live operator. Traditional ones use a keypad menu. An AI version understands what callers say and resolves common requests instead of only transferring them.

What is the difference between an auto attendant and an IVR?

An auto attendant routes callers through simple menu choices like press 1 for sales. An IVR adds self-service, such as collecting account details or verifying identity. An AI auto attendant does both in plain language: callers describe what they need, and the agent routes or completes the task without a menu.

Can an auto attendant phone system be AI-powered?

Yes. Most phone systems bundle a basic keypad auto attendant, but an AI voice agent is a different category. It understands natural language, so callers speak normally instead of pressing buttons, and it answers questions, books appointments, and routes on intent. The keypad becomes a fallback, not the only path.

Does it work with our existing business phone system and numbers?

Yes. The agent connects to your current carrier and numbers over SIP, including a Twilio integration, so you keep your phone system and port nothing. Route a slice of traffic to the AI auto attendant first, then expand once it proves out.

Is an AI auto attendant compliant for handling caller information?

The platform is SOC 2 Type II certified and HIPAA-ready with a self-service BAA, covering most call routing in healthcare and finance. PII is redacted from transcripts automatically, and you control how long call data is kept. On-premise deployment is available for stricter requirements.

How fast can we set up an auto attendant phone system?

Most teams go from signup to a live auto attendant in days. Pre-built receptionist and routing templates give you a working agent in minutes, and simulation testing validates it before launch. The steps to deploy conversational AI need no engineers for a standard setup.

What does an auto attendant phone system cost?

Pricing is pay-as-you-go from $0.07 per minute, with no platform fee or minimum, and $10 free credit to start. Against a full-time receptionist or after-hours answering service, it covers nights and weekends for far less. See pricing for your exact cost.

Should we use an auto attendant or a live receptionist?

A live receptionist handles nuance but works set hours, costs a salary, and takes one call at a time. An AI auto attendant answers every call at once, around the clock, and resolves most without a person. One client replaced eight team members with a single agent; more results are in our customer stories.

Revolutionize your call operation with Retell