A growing number of Nairobi businesses are retiring their analogue desk phones and per-minute airtime bills, and switching to VoIP — voice calls carried over the same internet connection that already runs the office. Done well, it is cheaper, easier to manage, and lets staff take the office line from anywhere. Done on a shaky connection, callers hear you break up, drop out, and turn robotic. Almost every time, the difference is the connection, not the phones.
VoIP does not need much bandwidth — it needs a steady one
A single voice call uses very little data, usually around 100 kbps in each direction with common codecs. Even ten simultaneous calls fit comfortably inside a modest package. Raw speed is rarely the problem. What matters is whether those small packets of audio arrive on time, in order, every single second of the call. A connection can post an impressive download figure on a speed test and still make a terrible phone line.
The three numbers that decide call quality
- Latency (ping) — the delay between speaking and being heard. Kept low, conversation feels natural. Once it climbs too high, people start talking over each other like it is a two-way radio.
- Jitter — the variation in how evenly packets arrive. Voice needs a smooth, regular stream; when the timing wobbles, audio turns choppy or garbled even though the speed test still looks fine.
- Packet loss — even one or two percent of lost packets produces audible gaps and clipped words. A phone call has no time to wait for anything to be sent again.
These are the same measurements we covered in our guide to reading a speed test — and for phone calls they matter far more than the headline megabits.
Upload capacity matters as much as download
Every call sends your voice out as well as bringing the other person’s in. On connections where upload is only a small fraction of download, a handful of calls at once — especially running alongside cloud backups, video meetings, or large file uploads — can fill the upload path and degrade every call on the line at the same time. For a business that depends on its phones, upload headroom is not a luxury.
Getting VoIP right on your network
- Put the connection first. A VoIP system is only ever as reliable as the line beneath it. A stable, consistently low-latency connection with real upload capacity is the foundation everything else sits on.
- Prioritise voice traffic. Most business routers can apply Quality of Service (QoS) rules that let call packets jump ahead of downloads and streaming, so a big file transfer does not wreck a call in progress.
- Wire the handsets where you can. Desk phones and adapters on an Ethernet cable avoid the extra jitter that WiFi can introduce, particularly in a busy office.
- Keep a fallback. If the phone system is business-critical, a backup internet connection keeps the lines open on the day the main link goes down.
How WebSpace Internet fits in
Our packages are unlimited and never throttled, so call quality does not fall away once you have used a certain amount of data in the month. For businesses running phones, card machines, and daily operations on one line, we can advise on dedicated bandwidth and a backup connection so a busy afternoon or a single outage does not take your phones down with it. Free installation and 24/7 support are standard, with packages starting from Ksh 1,500 a month.
If you are planning a move to VoIP, or your current setup keeps dropping calls, talk to us first about the connection underneath it. Call 0702 447 334 or visit our contact page and we will help you get it right.