Work out how many simultaneous calls your connection can actually carry, where the ceiling is, and whether upload — almost always the real bottleneck — is about to become your problem.
Use the speeds you actually get, not the ones you were sold. Run a speed test from the office during working hours.
Not your total headcount — how many are on a call at the same time, on your worst Monday morning.
| Type of call | Per call | How many |
|---|
Calls do not have the connection to themselves. This is where most capacity problems actually come from.
Bandwidth is only half of it. A fast line with high jitter still sounds terrible, and this is the part a speed test will not show you.
| Measure | Target | What happens past it |
|---|---|---|
| Latency (one way) | under 100 ms | People start talking over each other |
| Jitter | under 30 ms | Robotic or choppy audio |
| Packet loss | under 1% | Words and syllables drop out |
| Upload headroom | 20% spare | Quality collapses under bursts, not averages |
Hamilton Group measures what is actually happening on your line — jitter, loss and contention over time, not a one-off speed test — then fixes the cause. Book a free network review.