A voice communication system, which is connected to a LAN to which communication terminals are connected and to a public network to which telephones are connected, is provided with a communication server between the LAN and public network having different protocols from each other. The communication...http://www.google.es/patents/US5604737?utm_source=gb-gplus-sharePatente US5604737 - Voice communication system and voice communication method
Voice communication system and voice communication method
