Short duration call fees: what they are and when you pay them
Carriers add a surcharge when too many outbound calls hang up within 6 seconds. Here's what counts, when the fee starts and what it costs.
Most business phone plans now come with unlimited US calling, so a line on the invoice that says "short duration call surcharge" can be a surprise. It isn't a hidden minute charge, and most businesses will never see it. It's a per-call fee that carriers add when an account makes a lot of outbound calls that end almost as soon as they connect.
Here's how it works, where the line sits on CallSprout, and what to do if your calling pattern gets close to it.
What counts as a short duration call
Across the industry, a short duration call is an outbound call that connects and lasts 6 seconds or less. Three details matter:
- It has to connect. A busy signal or a call that rings out unanswered never connected, so it isn't counted at all.
- Voicemail counts as connected. If your call reaches a voicemail greeting and you hang up within 6 seconds, that's a short duration call.
- Only outbound calls count. On CallSprout, inbound calls are never part of the math. A caller who hangs up on your menu doesn't cost you anything.
Why carriers charge for them
Every call takes work to set up, whether it lasts 6 seconds or 60 minutes. Per-minute and unlimited pricing assume calls run long enough to cover that cost, and a flood of very short calls doesn't.
There's a second reason. A high share of calls that end within seconds is a classic sign of robocalling and auto-dialing gone wrong. People recognize an unwanted call and hang up, or a system dials a list and drops whatever it reaches. Carriers use the surcharge to discourage that traffic, and the same pattern can get a number flagged as Scam Likely, which hurts every call you make afterward.
When the fee starts on CallSprout
The fee is based on a ratio, not a count. At the end of each billing month, we divide your short duration calls by all of your outbound calls that connected that month.
- 15 percent or less: no fee, no matter how many short calls that is.
- More than 15 percent: every short duration call that month carries the surcharge, including the ones under the line.
That second point surprises people. Crossing 15 percent doesn't just charge the overflow. It charges the whole month's short calls, which is the common way carriers bill it.
What it costs
CallSprout doesn't set its own short duration rate. We pass through what our carriers charge for those calls, at cost, with no markup. It shows up as a separate usage line on the invoice after the billing month closes.
Published carrier surcharges run from about one cent to five cents per short call. Here's what that range looks like for an account that connects 3,000 outbound calls in a month:
| Short calls that month | Share of connected calls | Fee at 1 cent per call | Fee at 5 cents per call |
|---|---|---|---|
| 300 | 10% | $0 | $0 |
| 450 | 15% | $0 | $0 |
| 600 | 20% | $6.00 | $30.00 |
| 1,200 | 40% | $12.00 | $60.00 |
The dollar amounts are small for most accounts. The bigger cost is what a pattern like that says about your calling. If 40 percent of your connected calls end within 6 seconds, a lot of effort is going nowhere, and the people you're calling are learning to ignore your number.
What pushes an account over the line
Normal office calling rarely gets near 15 percent. When an account does cross it, the cause is usually one of these:
- A dialer that hangs up on voicemail. Answering machine detection that drops the call as soon as it hears a greeting turns every voicemail into a short call. On a list where most people don't pick up, that adds up fast.
- Stale lead lists. Wrong and reassigned numbers end in quick hang ups on both ends.
- Agents hanging up the second voicemail answers. It feels efficient, but it's the same pattern as the dialer problem.
- Scripts that test numbers. Anything that calls a number just to see whether it rings produces nothing but short calls.
How to stay under it
- Leave a message, or let the greeting play. A brief voicemail keeps the call well past 6 seconds and gives the person a reason to call back.
- Review your answering machine detection settings. If you run campaigns on Contact Center Pro, talk with our support team before you change detection timing, so the dialer stops dropping voicemail the instant it answers.
- Clean your lists before a campaign. Remove numbers that have bounced, gone to the wrong person or asked not to be called.
- Check your own ratio. Export a month of call history, keep only connected outbound calls, and count how many lasted 6 seconds or less. If you're near 15 percent, look at which users, campaigns or numbers those calls came from.
Our short duration calls page sums up the rule and how it ties to local presence dialing, and the full text is in our Terms of Service. If an invoice ever shows a short duration line you don't expect, ask us and we'll walk through the calls behind it with you.
Frequently asked questions
What is a short duration call?
An outbound call that connects and lasts 6 seconds or less. Calls that never connect, like busy signals or calls nobody answers, aren't counted, and inbound calls never count.
When does CallSprout charge for short duration calls?
Only when more than 15 percent of an account's connected outbound calls in a billing month are 6 seconds or less. At that point every short duration call that month carries the carrier surcharge, passed through at cost with no markup.
How much is a short duration call fee?
It depends on the carrier. Published carrier surcharges run from about one cent to five cents per short call. CallSprout passes through what the carrier bills, without adding a margin.
Does unlimited calling cover short duration fees?
No. Unlimited calling covers your minutes. The short duration fee is a per-call carrier charge that only applies when too many outbound calls end within 6 seconds.
