When we talk about Voice over IP or All-IP, we are talking about telephony using classic network technology instead of line telephony ( PSTN ), which we used to know from analogue and ISDN connections.
All-IP describes the provision of transport technology, e.g. by the Telekom. Voice over IP, on the other hand, is the actual telephony technology that makes it possible to make calls via such an All-IP network. Since the one makes little sense without the other, it is basically unimportant which term they use.
In order to be able to make VoIP calls you need the following components:
A complete list of our PBX partners can be found here: IP-PBX
When selecting these components such as the right phone, PBX provider and SIP trunk provider (ISP), there are several things to consider.
Many explanations about SIP and Voice over IP can also be found in our Glossary.