How to choose a cloud phone system for a growing team
A practical checklist for evaluating cloud telephony, from call routing to where your data is hosted.
Most teams pick a phone system by comparing feature lists. That is the wrong place to start. The features all look similar on a slide. What actually separates a good cloud phone system from a frustrating one is how it handles your real calls, on your real devices, with your real data.
Start with how calls should flow, not the feature list
Before you look at any product, write down what should happen when someone dials your main number at 9am on a Tuesday, and what should happen at 7pm on a Sunday. That single exercise tells you more than a demo.
Map these first:
- Who answers what. Which numbers reach which people or teams, and in what order.
- What happens when no one is free. Voicemail, a queue, an overflow to another team, or a callback.
- How it changes by time and day. Office hours, holidays, and out-of-hours routing.
Map your real call paths
A useful drill is to trace three calls end to end: a new sales enquiry, an existing customer with a problem, and an internal transfer. If you cannot describe each path in one sentence, the system you choose needs to make that path easy to build.
Apps, devices, and where people work
A modern team is rarely all in one office. The system has to follow people to wherever they actually take calls.
| What to check | Why it matters |
|---|---|
| Browser, desktop, and mobile apps | People answer on whatever device is closest, without a desk phone. |
| One number, many devices | A call can ring desk, desktop, and mobile together, and stop when answered. |
| Bring your own SIP phones | You keep the handsets you already own instead of buying new hardware. |
A phone system is only as good as the calls it does not drop.
A quick way to estimate capacity
If you want a rough sense of how many simultaneous lines you need, a simple starting point is:
concurrent calls = busy-hour calls × average call length in minutes / 60
It is not exact, but it stops you either over-buying capacity or getting caught short at your busiest hour.
Where your data lives
Call records, recordings, and transcripts are sensitive. For a European team, it is worth confirming where the platform runs and which rules apply to it.
- Ask where calls and recordings are stored, not just where the company is registered.
- Confirm the platform is hosted in the EU if GDPR matters to you.
- Check that signalling and audio are encrypted in transit.
A simple evaluation plan
You do not need a six-month procurement project. A focused fortnight is enough:
- Write down your three core call paths.
- Shortlist two or three providers that can build them without a support ticket.
- Run a real pilot with a handful of users on their own devices.
- Test call quality on mobile data, not only on office Wi-Fi.
- Confirm hosting, encryption, and how you would port your numbers out if you ever left.
Choose the system that makes your everyday calls boring. Boring, in telephony, is the highest compliment there is.