Flat-Rate Economics for SDR Teams: The Cost Model That Scales

The structural problem with per-minute billing for outbound

A per-minute carrier bill has a property that makes it fundamentally misaligned with sales development: it grows when your team performs better.

Consider what happens when an SDR manager runs a calling blitz. The team dials 120% of their usual volume for two weeks. Connect rates improve because the reps are more warmed up. Pipeline grows. Leadership is pleased.

Then the carrier bill arrives. It is 20% higher than last month. The CFO flags it in the budget review. The manager is asked to explain why telephony costs are increasing. The honest answer — "our team was more productive" — does not land well as a justification for higher infrastructure spending.

The result, in most organizations, is informal rationing. Managers add daily dial caps to the dialer settings. Reps learn not to redial a no-answer the same day. Blitzes become rare. The cadence gets throttled to keep the bill predictable.

None of that serves the revenue target.

Flat-rate: the mechanics

A per-seat flat-rate model charges by active agent, not by call volume, call duration, or talk time. The total monthly bill is:

Active seats × per-market seat rate = monthly carrier cost

In the US and Canada, UnlimCall's rate is $99 per seat per month. The daily equivalent is $5 per agent per day — useful for campaigns that run fewer than 20 working days in a month or for contractors engaged on a fractional basis.

Under this model, the following events produce zero additional carrier cost:

• An SDR redials a no-answer 45 minutes later
• A rep runs a two-hour calling block instead of one hour
• A campaign spikes during a quarterly blitz
• A new market list has a lower connect rate and requires more attempts per meeting booked
• A rep leaves a 20-second voicemail on every non-answer for three weeks

All of that activity is already paid for by the seat. The bill does not move.

The break-even calculation against per-minute

At what point does flat-rate become cheaper than per-minute billing?

Using a representative per-minute wholesale rate of $0.0085 for US/CA outbound (rates vary by provider and volume tier — this is an illustrative figure), the break-even against a $99/seat/month flat rate is:

$99 ÷ $0.0085 = 11,647 minutes per seat per month

At 20 working days and 8 hours of potential dialing time per day, 11,647 minutes represents 58 minutes of total call activity per agent per working day. That includes ring time, voicemail time, and live conversation.

An SDR making 80 calls per day with an average of 55 seconds of combined ring and talk time per attempt accumulates 73 minutes of call activity per day — well above the break-even threshold. Above break-even, every additional minute saves money compared to per-minute billing.

A rep making 100 to 120 dials per day — a reasonable target for a focused SDR — is well into the zone where flat-rate produces meaningful savings. At 120 dials with 55-second average call length, that is 110 minutes per day, 2,200 minutes per month. At $0.0085/min, that would cost $18.70 per day per rep on per-minute billing. On flat-rate, the equivalent cost is $5 per agent per day. The difference is $13.70 per rep per day — or $274 per rep per month.

For a 20-rep team, that is approximately $5,480 per month in carrier savings at 120 dials per rep per day.

These calculations use illustrative assumptions. Actual savings depend on your team's dial volume, average call duration, and the specific per-minute rates quoted by your current provider.

Budget predictability as a management tool

Beyond the direct cost comparison, per-seat flat-rate pricing gives finance teams something per-minute billing cannot: a carrier cost figure that is known before the month begins.

A sales leader budgeting for Q3 can say: "We will run 22 US seats and 8 UK seats. Carrier cost will be $22 × $99 + 8 × [UK rate] = [fixed number]." That number does not change based on how many dials the team makes or how many quarters the pipeline push goes.

Per-minute billing requires estimating average call duration, expected connect rates, voicemail ratios, and average dials per rep per day — and then accepting that any variance in team performance shifts the actual number.

For the CFO reviewing the sales budget, a fixed carrier line is simply easier to approve and defend than an estimate range.

What flat-rate requires from your infrastructure

Flat-rate SIP trunking is not a different technology — it is the same SIP trunk protocol priced differently. UnlimCall connects to any SIP-compatible dialer platform without requiring a platform change. ViciDial, FreePBX, GoHighLevel, and custom Asterisk or FreeSwitch setups all work.

What you configure in your dialer:

1. UnlimCall SIP credentials (provisioned at onboarding)
2. Outbound caller ID numbers (provisioned for your account in each activated market)
3. Codec preferences (G.711 and G.729 supported)

You do not need to change your CRM integration, your call recording setup, or your rep workflows. The trunk replaces the carrier, not the platform.

Comparing at the team level

Per-minute estimates use $0.0085/min × 55 sec average per dial × working days. Actual rates vary by provider and volume tier. Use the calculator at /pricing/ to model your specific configuration.