Patent ID: 8767590
Filing Date: 2014-07-01
Classification: H04L

Abstract:
1. A multimedia conference system that enables direct communication between private network and the Internet, including: a plurality of user agents (to receive call requests) positioned in the private network; a calling SIP terminal positioned in a public network; a network address translation (NAT) positioned on the gate of the local network as barrier between the calling terminal and the user agent; a SIP Proxy Server positioned between the calling terminal and private network and logically installed in parallel with said NAT to receive session initiation protocol messages transmitted from the calling terminal, connect, and transmit IP addresses without going through said NAT and without using a path-coupled signaling protocol to establish a direct connection with the user agents, so as to send the message to specific User Agent(s), said SIP Proxy Sewer has a Network Interface directly connected to a public network and a Network Interface directly connected to the private network.