For fixed telephony you need a provider for the connection and a provider for the fixed telephony service (calls).

You can buy a connection and calls from a single operator or from several operators, by using technologies based on the copper telephone line, the TV cable or the Internet.

What are the technical possibilities to make or receive calls from a fixed appliance ?

These are the possibilities in a nutshell:

Connection     Technology     Fixed telephony provider Possibilities and equipment
On the telephone network PSTN / ISDN (classic analogue or digital telephone line) Incumbent (Proximus) or alternative operator using the Proximus network Fixed analogue telephone (PSTN) or digital telephone (ISDN), cordless or not (DECT). You can ask to keep the number of your landline
On the telephone network PSTN / ISDN (classic analogue or digital telephone line) C(P)S operator

Call using an access code (CS/CPS). For this a previous subscription with the incumbent or an alternative operator is needed.
This service will phase out as of 2020

On the DSL network Voice over IP (VoIP) through a DSL line Incumbent (Proximus) or alternative operator using the Proximus network

Modem supporting VoIP and fixed telephone, cordless or not (DECT).
Fixed number portability possible

On the fibre optics network Voice over IP (VoIP) through a fibre optics line Incumbent (Proximus) or alternative operator using the Proximus network

Modem supporting VoIP and fixed telephone, cordless or not (DECT).
Fixed number portability possible

On the cable television network

TV cable

Incumbent (Telenet, VOO or Brutélé) or alternative operator using the cable TV network

You can ask to keep the fixed telephony number
Fixed telephone or DECT

On the Internet

VoIP out (no number allocated to receive calls)
 Nomadic VoIP (with a number that can be used worldwide)

 

 

No number transfer required; however Internet service is required
Access to the emergency numbers (112, 100, 101) impossible
Specific telephone or tablet or PC required

Therefore, certain solutions require you to have an Internet connection and appropriate equipment (modem, PC, VoIP, ...). 

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