A voice AI receptionist can look inexpensive when you only see the price per minute. Then the proposal arrives: setup, phone service, CRM work, testing, support, and a few extras you did not know you needed.
The useful question is simple: what will it cost to run the service your business actually needs? Here is how I would break down the budget, what to ask a provider, and a worked example you can adapt to your own call volume.
Start with what the receptionist must do
Answering basic questions and taking a message is one scope. Checking a live calendar, identifying an existing customer, booking an appointment, updating a CRM, and transferring urgent calls is a more involved service.
Write down the finished result before comparing prices. For example: “Answer after-hours enquiries, capture the caller’s details, create a lead in our CRM, and send the right team a callback task.” That gives a provider something concrete to price and gives you a way to judge whether the implementation works.
Setup: the work before the first real call
A setup fee should cover identifiable work: discovery, conversation design, business information, agent configuration, routing, testing, and launch preparation. Integrations may be included or priced separately.
Ask for deliverables. How many call scenarios will be tested? Who supplies and approves the answers? Does the handover include access, documentation, and a way to pause the agent? How many launch refinements are included?
A DIY build may have no agency setup invoice, but somebody still spends time designing and checking it. A managed service may charge onboarding, a project fee, or a higher monthly subscription. None of those structures tells you the quality of the work by itself.
Minutes: calculate the volume before comparing rates
Start with your recent phone records:
Six hundred calls lasting three AI-handled minutes each produces 1,800 minutes. Use the portion handled by AI, then account separately for any human transfer leg.
As a public pricing reference, Retell AI lists $0.07–$0.31 per minute for AI Voice Agents. Its detailed calculator separates infrastructure, voice, language model, telephony, and add-ons. Price the configuration you intend to use, rather than assuming the lowest advertised rate covers every option.
Check billing rules too. Retell says silence counts while the agent is listening and the AI fee stops after transfer, while telephony charges continue. Other providers and packages may use different rules. Ask about rounding, test calls, voicemail, overages, and what an “included minute” covers.
Phone service: the number and the connection are separate costs
You may pay for a phone number, carrier minutes, forwarding, SIP connectivity, and transferred calls. Keeping an existing business number can also mean keeping the associated phone-system subscription.
For a concrete US reference, Twilio’s public Programmable Voice page lists local inbound calls at $0.0085 per minute and a local number at $1.15 per month. These are carrier charges for that route, not an all-inclusive AI receptionist price.
Avoid double-counting: if your provider already includes telephony in its quoted rate, do not add the same carrier leg again. Conversely, a rate that excludes telephony needs a separate allowance. Transfers, toll-free numbers, destinations, and existing phone-system fees can change the total.
Integrations: a conversation should leave useful work behind
A notification email is a different integration from a live appointment booking. Booking requires decisions about availability, time zones, duplicate records, cancellations, permissions, and what happens when a system is unavailable.
Separate the initial connection work from recurring software costs. An automation platform may charge by task or execution; a CRM may require a particular subscription or API access. Ask who pays for those accounts and whether the implementation price includes monitoring and fixing failures.
Keep the first workflow focused. You can add more once the core caller journey is working. Our voice AI pilot planning checklist is a useful starting point.
Support: decide who owns the service after launch
Someone needs to review exceptions, update business information, test changes, and help when callers encounter a problem. If you manage the agent yourself, that responsibility sits with your team.
If you buy ongoing support, ask what is actually included: response hours, incident handling, call reviews, configuration changes, integration maintenance, and development time. Platform support and a team managing your particular business workflow are different services.
A low monthly price can still work well for a capable internal team. A managed service can make sense when you need a named owner. The budget should reflect the responsibility being purchased.
An illustrative monthly cost breakdown
Here is one hypothetical budget for a small business receiving 600 calls per month, with an average of three AI-handled minutes per call. It assumes separately billed AI and US local inbound carrier service.
This is a budgeting example, not a quote, a market average, or a published package from Retell AI, Twilio, or Action2Call®. The $0.12 AI rate, integration allowance, support allowance, and setup figure are assumptions. Only the stated Twilio carrier inputs below come from its public rate card.
Illustrative scenario · 1,800 AI-handled minutes · USD
Bars share a zero baseline and scale to the largest component ($300). Excludes setup, taxes, existing phone/CRM subscriptions, extra call legs, optional add-ons, and internal staff time.
| Cost item | Calculation or allowance | Monthly |
|---|---|---|
| AI usage | 1,800 minutes × assumed $0.12 | $216.00 |
| US local inbound carrier | 1,800 minutes × $0.0085 | $15.30 |
| One local number | Twilio published monthly rate | $1.15 |
| Integration software | Hypothetical allowance | $50.00 |
| Ongoing support | Hypothetical allowance | $300.00 |
| Total | Recurring budget before exclusions | $582.45 |
The point is the structure: in this example, the AI minutes are only part of the monthly bill. If you self-manage, the external support invoice might disappear, but the work becomes an internal responsibility.
Keep setup separate from the monthly number
Suppose this same hypothetical project has a $2,500 one-time setup fee. That is an invented planning input, not a recommended price or an offer from any named company.
First month: $3,082.45. Following months: $582.45 at the same usage and scope.
This prevents a common comparison mistake: treating one proposal’s setup-inclusive first month as equivalent to another proposal’s recurring monthly price. Spread setup across a year for planning if useful, but keep the actual upfront payment visible.
What happens if call volume changes?
Using the same assumptions and holding integration and support allowances fixed, the recurring budget changes like this:
| Monthly calls | AI minutes | Illustrative monthly cost |
|---|---|---|
| 300 | 900 | $466.80 |
| 600 | 1,800 | $582.45 |
| 1,200 | 3,600 | $813.75 |
These are arithmetic scenarios, not a forecast. Real support needs and software tiers may increase with volume. Longer conversations, extra transfer minutes, or a different model can also change the result. Test a normal month and a busy month before agreeing to a package.
The questions I would ask before signing
- What is included? List setup deliverables, monthly allowances, phone charges, and optional features.
- What happens over the allowance? Get the overage rate and a way to monitor spend.
- Who owns the accounts? Confirm access to the agent, phone number, integrations, and relevant records.
- What does support cover? Distinguish incident response from new development or a changed scope.
- What happens on a failed booking or transfer? Define the fallback and who receives the exception.
- What are the exit terms? Understand cancellation, minimum commitments, number portability, and handover.
Then compare the business outcome. Track successful bookings, completed messages, correct handoffs, and the staff time still needed to review exceptions. A low cost per minute is useful only when the service does the job you are paying for.
Sources and pricing notes
Public references: Retell AI pricing and billing FAQ and Twilio US Programmable Voice pricing. Rates checked October 17, 2026. Prices can change; confirm the selected configuration and route before purchasing. All example totals are in USD before taxes and the exclusions noted above.
Joshua M. Alexander is a Solutions Director at Retell AI and founder of JGRobo Marketing, Inc., the company behind Action2Call® and Business Meets AI. This article includes links to companies with which the author has a professional or ownership relationship. The illustrative budget is educational and is not a quote from those companies.