IP telephony (short for Internet Protocol telephony) or VoIP (short for voice over internet protocol). IP telephony is a technology that makes it possible to implement the telephone service on IP infrastructure so that it can replace the conventional telephone technology including ISDN and all components.
To gain a general understanding of how Voice over IP works, we will give you some basic knowledge about components, architectures, codecs and protocols. Since this is an IP network based technology, but there is also a completely independent level of its own that originates from the SIP protocol.
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:
two VoIP clients
a functioning network with internet connection
a SIP-Trunk from your All-IP provider
a "telephone system" IP PBX
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