Patent ID: 6934282

Claim:
A gateway system for voice communication of a communication system for performing communication among PSTN terminals connected to a PSTN, IP terminals connected to an Internet protocol-based local area network (LAN) and remote terminals of a different area connected via the Internet, the gateway system comprising: a PSTN gateway connected to the PSTN and the LAN for rendering the PSTN terminals connected to the PSTN and the IP terminals connected to the LAN to communicate with each other; and an inter-gateway receiving voice packets transmitted from the PSTN gateway and from the IP terminals, and generating and transmitting compressed voice packets to the Internet, the inter-gateway receiving compressed voice packets from the Internet and uncompressing the received compressed voice packets for rendering the IP terminals and the PSTN terminals connected to the PSTN gateway to communicate with the remote terminals through the Internet, wherein voice packets from the IP terminals connected with the LAN are transmitted to the remote terminals through the inter-gateway after being compressed, voice signals from the PSTN terminals connected with the PSTN are packetized by the PSTN gateway and transmitted to the remote terminals through the inter-gateway after being compressed, and the PSTN terminals and the IP terminals communicate with each other by uncompressed voice packets through the PSTN gateway.