An ip based telephone system

The invention claims a hybrid device, capable of deploy the existing telephone exchange phone network the packet-switched network. Circuit switch network transmission an IP-based packet-switched network (30) replacing, a switch circuit, infrastructure for example terminal, a switch equal, and retains. The is embodiment of this invention, user (10,11,20,21) and telephone machine (40,50) and an IP-based Internet (30) such packet-switched network connection, and is separated by a. The user (10,11,20,21) and plate (40,50) signal transmission and standard user to the network protocol, a invention V5.1 PSTN and ISDN BRI or a ISDN PRI DSS1. On the standard user to the network protocol on IP TCP or a UDP the same the IP network protocol is.