VOIP · PBX · BUSINESS GUIDE

VoIP PBX for businesses: how to choose and install without mistakes

Migrating a company's telephony to VoIP can reduce the phone bill by 40-60% and add capabilities unthinkable with an analogue PBX: call queues, IVR, recording, CRM integration and full mobility. This guide explains how to do it right.

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A VoIP PBX (IP PBX) is not just an analogue system that works over the internet. It is a unified communications platform integrating voice, messaging, video conferencing and presence in a single tool. The first step is to understand what the business actually needs before choosing a platform.

On-premise vs cloud VoIP PBX

ON-PREMISE

Local server (FreePBX, Grandstream UCM, 3CX)

The PBX runs on a server on the premises. Full configuration control, no monthly per-extension fees. Requires internal IT maintenance or an external support contract. Recommended for businesses with 20+ extensions or strict privacy requirements.

CLOUD / HOSTED

Managed PBX by provider

Platform hosted by the provider. No hardware to manage. Cost per extension per month (€4-15/ext). Automatic updates. Ideal for small businesses, remote teams or those without internal IT.

Network requirements for quality VoIP

Minimum parameters

Latency < 150ms end-to-end
Jitter < 30ms
Packet loss < 1%
Bandwidth: ~100 Kbps per G.711 call

Network configuration

Separate VLAN for VoIP traffic
QoS with DSCP marking (EF for voice)
Switches with QoS support (layer 2)
Router with SIP/RTP traffic prioritisation

Internet connection

Symmetric fibre recommended
SLA with guaranteed resolution time
4G/5G backup line for continuity

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