A Belgian SME with 10 phone lines pays on average between €400 and €800/month with a traditional operator. The same in VoIP: between €150 and €300/month. The difference largely funds installation and maintenance — and you also get a professional switchboard, softphones and total flexibility.
J’entends encore trop souvent « on a toujours eu notre téléphonie fixe with Proximus, ça marche bien ». C’est vrai que ça marche. Mais « ça marche » n’est pas la même chose que « c’est optimal pour votre business en 2026 ».
Here is the real comparison, with real numbers.
What you really pay with traditional telephony
Traditional telephony
per month on average — SME 10 lines
VoIP telephony
per month on average — SME 10 users
But beyond the monthly cost, traditional telephony has other hidden costs that few SMEs really calculate:
- Long-term contracts with termination penalties
- DECT equipment and physical phones to renew
- Additional lines billed individually
- Calls to mobile often out of plan
- No flexibility for remote work
- Impossible to keep the same number if you move
What VoIP concretely changes
VoIP — Voice over IP — is simply telephony that goes through your internet connection instead of the traditional phone network. But the practical consequences are significant:
- Your number follows you everywhere — office, home, mobile
- Softphone on PC and smartphone included
- Professional switchboard with menus, queues, schedules
- Adding or removing a line in a few clicks
- Call recording possible
- Detailed statistics on incoming/outgoing calls
- Natively remote-work compatible
Real savings over 3 years
📊 SME 10 users — 3-year projection
Full comparison
| Criterion | Traditional telephony | NexK IT VoIP |
|---|---|---|
| Monthly cost (10 users) | 400 – 800 € | 150 – 300 € |
| Installation | Technician + equipment | Remotely in a few hours |
| Remote work | Not native | Native — same number everywhere |
| Line flexibility | Contract, delays | Immediate addition |
| Professional switchboard | Basic | Full — menus, queues, schedules |
| Moving | New contract | Same number, no interruption |
| Call quality | Excellent | Excellent (fiber recommended) |
The only requirement: a good internet connection
📡 Fiber recommended — but not mandatory
VoIP works with any decent connection. As a rule, count on 100 Kbps per simultaneous call. For 10 simultaneous calls: 1 Mbps dedicated to VoIP is enough. With standard fiber at 200 Mbps, you have plenty of capacity. We always configure QoS on the firewall to prioritize VoIP calls — your conversations go first, regardless of network load.
📞 Calculate your VoIP savings
Use our VoIP calculator to see exactly how much your SME can save by switching to IP telephony.