Internal and external internet protocol terminals communication system, has control server that is provided in public IP network and that controls mediation system via communication channel passing via firewall

摘要

The system has a mediation system (2) related to an internal IP terminal (1) and provided in a private internet protocol (IP) network (7). The system (2) includes a transmission control protocol (TCP)/user datagram protocol (UDP)/IP interface provided for an external IP terminal (5). A control server (4) provided in a public IP network controls the system (2) via a communication channel (6) passing via a firewall (3).