Per-minute vs per-call answering service pricing: how each model works and which one costs less for your calls

Published October 26, 2026 by Special Interest Answering Service (SIAS), Joliet, Illinois. Competitor prices were read from each company's own website on that date; SIAS figures come from 1,815 real billing cycles and about 248,000 call records. Prices change; check the linked pages before you decide.

Live answering services bill in one of two ways. Per-minute services charge for the time an operator spends on your account. Per-call services charge a flat amount for each call, whatever its length. The two models can produce very different bills for the same phone traffic, and the difference comes down to one number: how long your calls last. This guide explains what each model actually measures, what gets rounded, what the add-ons are, and where the break-even point sits, using published prices and SIAS's own billing data.

What per-minute billing measures

A per-minute plan bundles a block of operator minutes for a flat fee and charges an overage rate for minutes beyond the block. The important question is what counts as a minute, because services define it differently. At SIAS a billed minute is time an operator is working your account:

• talking with your caller;
• setting up a patch (transfer) to you or your on-call person;
• calling you back with an urgent message;
• sending your messages and paging or texting your on-call list.

Not billed at SIAS: ring time, time the caller spends in your recorded greeting, and talk time after the operator connects the caller to you. Seconds are added up for the whole billing cycle and the total is rounded down to the nearest minute. Other per-minute services round differently. AnswerConnect's plan page states that interactions are rounded up to the nearest minute, with the first 30 interactions under 30 seconds in a cycle not counted; Ruby publishes its minute blocks but, as of October 26, 2026, not its overage rate. Ask any per-minute service three questions: what starts the clock, what stops it, and whether rounding is per call or per cycle.

What per-call billing measures

A per-call plan bundles a number of calls for a flat fee and charges a per-call overage above it. Length does not matter: a 40-second "is the office open?" costs the same as a 12-minute intake. Smith.ai, the most-cited per-call service, listed these plans on October 26, 2026: $300 for 30 calls, $810 for 90 calls and $2,100 for 300 calls per month, which is $10.00, $9.00 and $7.00 per call, with overage calls at $11.50, $10.50 and $8.50. Add-ons are also per call: $1.00 per call for a Spanish-language line and $1.50 per call for appointment booking.

Per-call pricing is easy to predict if you know your call count, and it rewards long calls. It penalizes short calls, wrong numbers, vendor calls and repeat callers, because every one of them is a full unit.

Published prices side by side

SIAS bills every 4 weeks, 13 times a year; the monthly equivalent is the 4-week price times 13 divided by 12. Larger SIAS plans: Growth $219 for 200 minutes ($0.89 overage), Business $379 for 400 minutes ($0.85), and volume tiers from $515 for 560 minutes to $960 for 1,200 minutes. Full detail, including six months of real invoice data, is on Pricing and Plans Explained. Side-by-side pages: SIAS vs Ruby, SIAS vs Smith.ai, SIAS vs AnswerConnect.

The number that decides it: your average call length

Across every SIAS account, operators averaged 82 to 90 seconds of billed time per handled call between July 1 and October 18, 2026 (about 248,000 call records from our Telescan Spectrum switch). That average covers message taking, dispatch calls, appointment booking and transfers for HVAC and plumbing contractors, property managers, medical and dental offices, law firms and real estate businesses. At that length:

• 100 SIAS minutes cover roughly 65 to 75 answered calls, so the Starter plan works out to about $2.20 to $2.40 per call;
• the same 65 to 75 calls on a $10-per-call plan cost $650 to $750 at list price, before any per-call add-ons;
• the gap narrows as calls get longer and closes somewhere between 6 and 12 minutes per call, depending on which per-minute rate applies.

The rule of thumb: if your calls are mostly short (messages, dispatch, scheduling, "are you open?"), per-minute billing is cheaper, usually by a wide margin. If your calls are mostly long (full legal or insurance intake, detailed technical triage), per-call billing can win above roughly 6 to 12 minutes per call. A business with a mix should price both ways with its own call log, not with the averages in this guide.

How often per-minute customers actually go over

The usual objection to per-minute pricing is "overage anxiety": the fear that the bill is unpredictable. SIAS's own billing data, 1,815 invoices on the current plans from April 27 to September 30, 2026, shows how often it happens and how large it is.

Put differently, nearly three out of four Starter cycles carry no overage at all, and when a Starter customer does go over, the typical extra charge is about $34. Customers who are over every cycle usually belong on the next plan, which SIAS changes at the next cycle boundary at no fee.

What to check before you compare two quotes

1. Rounding. Per-call rounding up turns a 61-second call into 2 minutes. Per-cycle rounding down (SIAS) never adds time. On a 100-minute plan the difference can be 20 to 30 minutes a cycle.
2. What starts the clock. Ring time and greeting time should be free. Ask.
3. Transfers. Some services bill the entire patched conversation as operator time. SIAS bills the setup only; talk time after the connection is not billed.
4. Per-call add-ons. On per-call plans, a Spanish line or appointment booking can add $1.00 to $1.50 to every call that uses it. At SIAS, bilingual answering and appointment scheduling are included and billed as ordinary minutes.
5. Setup fees and minimum terms. AnswerConnect lists a $49.99 setup fee on its Entry plan. SIAS has no setup fee and no contract; service renews every 4 weeks.
6. Overage rate versus plan rate. A low overage rate ($0.99 at SIAS versus $2.50 at AnswerConnect Entry, or $11.50 per call at Smith.ai) is what protects you in a busy month.
7. Billing cycle. "Every 4 weeks" means 13 bills a year, not 12. Compare monthly equivalents, not sticker prices.
8. Unused minutes. At SIAS minutes do not roll over. Size the plan to a normal cycle, not the busiest one.

Three worked examples

A plumbing company, 60 calls a month, 1.5 minutes each (90 minutes). SIAS Starter: $159 every 4 weeks, no overage, about $172 a month. Per call at $10: $600 a month plus $90 if 60 of those calls book appointments. Per-minute wins by more than $400 a month.

A solo law practice, 40 calls a month, 8 minutes each (320 minutes). SIAS Business: $379 for 400 minutes, about $411 a month. Per call at $9 (the 90-call plan is the smallest that fits): $810 a month. Per-minute still wins, but by less, because long calls eat minutes. At 12 minutes per call (480 minutes) SIAS Business plus 80 overage minutes is $447 every 4 weeks (about $484 a month), versus $810, so per-minute remains cheaper until calls get very long or the per-call plan is sized exactly.

A property manager, 250 calls a month, 1.4 minutes each (350 minutes). SIAS Business: $379 plus nothing, about $411 a month, plus $10 per property address per cycle if each address has its own greeting and on-call list. Per call: the 300-call plan at $2,100. The volume of short calls makes per-call pricing five times more expensive.

Sources: SIAS Stripe invoices dated April 27 to September 30, 2026 (1,815 cycles on the current plans); SIAS Telescan Spectrum call records July 1 to October 18, 2026 (about 248,000 records); ruby.com/plans-and-pricing, smith.ai/pricing and answerconnect.com/plans-direct as read on October 26, 2026. Special Interest Answering Service is family-owned, based in Joliet, Illinois, founded in 1980, and not affiliated with Specialty Answering Service (SAS).

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