Patent ID: 7301937
Filing Date: 2007-11-27
Classification: H04L,H04M

Abstract:
1. A system for automatically selecting a voice data transmission and reception system for an IP network on which an IP terminal is connected to a called party's terminal through a firewall, wherein the IP terminal comprises: a call controlling portion for processing a VoIP (Voice over Internet Protocol) control signal; a voice input and output portion for inputting and outputting a voice and moving picture; a digital and analog process portion for performing a digital and analog converting process for the input voice and moving picture; an IP communication portion for transmitting the voice and moving picture according to the IP; an RTP port confirming portion for confirming whether or not a communication according to the RTP can be made; and a history table on which communications made through the firewall are recorded, wherein the RTP port confirming portion is configured to confirm whether or not the communication according to the RTP can be made, wherein when the communication according to the RTP can be made, an RTP port is used and voice data is sent to the IP communication portion so as to packetize the voice data for the communication according to the RTP, and wherein when the communication according to the RTP cannot be made, with reference to the history table, a port through which the voice data communication can be made is determined and the voice data is sent to the IP communication portion.