The implementation of voice over internet protocol on private automatic branch exchange using analog telephone adapter

Voice over internet protocol is a technology that has offer to the telephone by Internet Protocol and has developed to be VoIP IP PBX which can be connected between VoIP and Private Automatic Branch eXchange, the use of technology VoIP IP PBX would be being easy more and emphasizing of the cost to the increasing extension telephone analog which is on the private automatic branch exchange without added Central Private Automatic Branch eXchange. To implemented that idea, so we make server VoIP by using elastix as IP PBX server which is installed to the PC, and then using analog telephone adapter as signal conversion analog to the digital to be connected to the private automatic branch exchange. Measuring is done by calling between client as much as 12 times in 5 minutes. And the value of quality of service Jitter is 2,004 ms, Delay is 91,562 ms, and Packet Loss is 3%, so it can be categorized that quality of internet telephone is well done, it is based on ITU-T G. 114.