What does All-IP mean?
All-IP describes the transition to Internet Protocol (IP) based voice networks. Such networks use IP technologies in order to connect phone calls and allow users to communicate across their IP network. The process is similar to how computers connect and communicate using the Internet when exchanging information.
The term All-IP became popular in the telecoms industry when Voice Providers started switching off their ISDN networks in favour of SIP (Session Iniatated Protocol) trunks. That said, All-IP does not just refer to SIP trunking. The practice of deploying media gateways to connect ISDN and Analog networks to IP networks can (in theory) be referred to as All-IP, although the process of using Gateways is becoming less and less common place as businesses switch to cloud communication platforms.