Flat-Rate vs Per-Minute Outbound Calling — The Real Math

How Per-Minute Billing Works Against You

Per-minute SIP trunking charges by the connected minute. At surface level — $0.0085/min for US termination, or $0.01/min for many European destinations — the number looks small. Multiply it by a real dialing day and it stops looking small.

A productive outbound agent in a sales or collections environment connects 150–200 minutes per day. At 22 working days per month that is 3,300–4,400 connected minutes per agent per month — and that figure climbs steeply with auto-dialers, power dialers, and predictive systems that keep agents on calls with no gap.

At 10,000 connected minutes per agent per month (an aggressive but realistic predictive-dialer workload), the per-minute bill alone reaches $85–$100 per agent before you add your dialer license, local caller ID fees, and STIR/SHAKEN pass-through surcharges.

UnlimCall replaces that variable entirely. One flat rate, unlimited minutes, no overage.

Side-by-Side Cost: Flat-Rate vs Per-Minute

Assumptions for per-minute column: 10,000 connected minutes per agent per month × ~$0.0085/min blended US termination rate. Verify current rates from your carrier before committing. Per-minute estimate does not include dialer license, local caller ID provisioning, or STIR/SHAKEN surcharges.

The table above is the honest version. Per-minute wins on raw cost at moderate volume. Flat-rate wins on three things per-minute cannot offer: predictability, no throttling incentive, and network quality that does not degrade when you dial harder.

Where Flat-Rate Pulls Ahead

No throttling incentive. On per-minute trunks, every extra minute costs money. Operations teams unconsciously trim call lengths, rush closings, and reduce agent talk time to manage the bill. Flat-rate removes that pressure entirely.

Answer rate lift from local caller ID. Per-minute carriers typically offer a shared pool of numbers or charge extra for local presence. UnlimCall provisions local caller IDs on demand at onboarding across all 33 live markets — no pool, no shared reputation risk.

STIR/SHAKEN signing for US and Canada. Calls originated on UnlimCall's US and Canadian routes carry STIR/SHAKEN attestation. Signed calls display a verified badge on compatible handsets, measurably increasing answer rates. This is included — not an add-on.

Predictable budgeting. A 100-agent team knows their trunk bill to the dollar on day one of the month. Per-minute bills fluctuate with campaign volume, list quality, and dial rate — the exact variables that finance teams hate forecasting.

One contract for 33 markets. Per-minute pricing varies dramatically by destination. Agents dialing Germany, Australia, and Brazil from the same campaign face three different rate structures, three sets of carrier negotiations, and three support contacts. UnlimCall is one agreement, one invoice.

The Call Quality Argument

Per-minute carriers route to least-cost termination. When margins are measured by the second, quality routing is a cost center. UnlimCall's flat-rate model inverts this: our margin is captured at the seat, so routing decisions optimise for audio quality and answer rate — not termination cost.

Sub-50ms low-latency audio is maintained across all 33 markets via regional media proxies. You will not hear this in a demo call; you will hear it over 500 agents across six time zones.

When Per-Minute Still Makes Sense

Flat-rate is not always the answer. If your team dials fewer than 4,000 minutes per agent per month, per-minute trunking is mathematically cheaper. If you operate in a single country with no expansion plans, a local carrier may beat us on price. We will tell you this on a call rather than oversell you a seat that does not pay back.

The break-even is approximately 5,800–6,500 connected minutes per agent per month depending on destination and carrier rate. Above that number, flat-rate wins on cost. Below it, flat-rate wins on simplicity.