The Pricing Model Question

When evaluating VoIP services for international calling, you will encounter two fundamentally different pricing structures:

Per-minute (PAYG): You pay only for minutes actually used. No monthly fee. No minimum. Credits typically do not expire.

Monthly subscription: You pay a flat monthly fee that covers a bundle of minutes (often "unlimited" domestic, with international at a per-minute rate on top, or at a higher flat fee).

The "subscription is better value for heavy users" assumption is widely held but not always true. Here is a rigorous model.

The Hidden Cost of Subscription Plans

Subscription pricing includes several costs that per-minute pricing does not:

Monthly base fee: Even if you make no calls in a given month, you pay the base fee.

Per-seat structure: Most subscription VoIP products charge per user per month. If you have 10 employees who occasionally make international calls, you are paying for 10 seats even though on any given day only 2 or 3 are actively calling.

International rates on top of subscription: Many subscription plans advertise "unlimited calling" — which means unlimited domestic calling. International destinations (i.e., the expensive calls) are often charged per-minute on top of the subscription fee, and sometimes at higher rates than PAYG services.

Unused feature overhead: Enterprise VoIP subscriptions bundle voicemail, auto-attendants, CRM integration, and other features you may not need. You pay for these regardless.

A Worked Example: Small Distributed Team

Consider a 15-person company where 5 employees make international calls regularly, and the other 10 make occasional international calls — perhaps 10 minutes each per month.

Monthly international call volume:

  • 5 heavy users × 120 min/month = 600 min
  • 10 occasional users × 10 min/month = 100 min
  • Total: 700 international minutes/month

Scenario A: Per-seat subscription at $25/seat/month + $0.05/min international

  • 15 seats × $25 = $375/month base
  • 700 min × $0.05 = $35 international usage
  • Total: $410/month

Scenario B: Shared PAYG credit pool at $0.02/min international average

  • 700 min × $0.02 = $14/month
  • No base fee
  • Total: $14/month

Scenario C: 5 seats on subscription ($25/seat) + 10 occasional users on PAYG

  • 5 seats × $25 = $125/month
  • 5 heavy users: included in subscription (assuming international is included — often it is not)
  • 10 users × 10 min × $0.02 = $2/month PAYG
  • Total: $127/month (if subscription includes international) or $163/month (if it does not)

The PAYG model wins decisively when per-seat fees dominate the cost structure and actual usage is moderate.

When Does Subscription Win?

Subscription becomes cost-competitive when:

Calling volume is very high and concentrated. If you have a 5-person team each making 300+ minutes of international calls per month, a subscription with a good international bundle can beat PAYG.

You need domestic calling too. If your team makes high volumes of both domestic and international calls, a subscription with "unlimited domestic" plus international minutes is often better value than PAYG for each individually.

You need inbound call infrastructure. PAYG outbound services do not give you inbound phone numbers, auto-attendants, or voicemail. If you need a real business phone system (not just outbound calling), a hosted VoIP subscription is the right product regardless of per-minute economics.

The Break-Even Calculation

For pure outbound international calling (no inbound infrastructure needed), the break-even between a PAYG service and a subscription is:

(Monthly subscription fee) ÷ (Per-minute PAYG rate) = Break-even minutes per month

If a subscription costs $30/month and PAYG costs $0.02/minute:

30 ÷ 0.02 = 1,500 minutes/month break-even

That is 25 hours of international calls per month — roughly 1.5 hours every business day — before the subscription becomes cheaper than PAYG for a single user. Most individual users and many teams are well below this threshold.

The Decision

Choose per-minute PAYG (Voxa) if:

  • Your international calling is moderate or irregular
  • You have many users with low individual call volumes
  • You do not need inbound numbers or call routing
  • You want zero commitment and no wasted spend during slow months

Choose a monthly subscription if:

  • You have consistent, high-volume international calling (over ~1,000 min/user/month)
  • You need an inbound phone number and routing features
  • Your primary need is domestic calling with international as a secondary use case

For most teams we speak to, PAYG outperforms subscription for international calling once the per-seat fees of subscription plans are properly accounted for. The subscription looks cheaper per minute but expensive per seat.