VoIP Telephones823. VoIP TelephonesVoIP stands for “Voice over IP” and refers to telephony where voice data is trans-mitted via Internet Protocol (IP). VoIP enables companies to use existing companydata lines without having to lay new telephone lines. To be able to use this tech-nology, however, suitable devices which support it are necessary.The following IP system telephones are suitable, e. g. OpenPhone 73 IP andOpenPhone 75 IP. These telephones offer the same range of functions that theOpenPhone 73 and OpenPhone 75 standard system telephones offer and areoperated in exactly the same way. The number of keys and their functions and thedisplays are the same for both the standard and the IP system telephones. Keypadextensions can also be connected to IP system telephones (see also the chapterKeypad Extensions starting on page 31).If your system administrator has configured an IP system telephone for you, thefollowing information will be of interest to you:■ During some connections you may experience short breaks or hear an echo.This depends on the transmission quality of the line and is not due to your tele-phone functioning improperly.■ If your telephone is being connected to the line or the connection is inter-rupted (e. g. if the company network breaks down), the required terminalsoftware will be loaded when you reboot the telephone. This happens auto-matically and may take about 1 minute. The telephone is ready for operationwhen the display shows the time and the internal telephone number. Then youmay use the telephone as per usual.■ When telephoning via connected headset, it is advisable to wait a second afteraccepting an incoming call before you begin to speak. This brief time interval isnecessary to allow the VoIP connection to be established between yourself andthe caller.IP System Telephone PortsIP system telephones have additional ports not included with the standard systemtelephones. Above the display on the back of the device there are two RJ45 jacksfor connecting the data line(s). These ports are labelled LAN and PC. Dependingon how your workstation is equipped technically, there are two options for con-necting the IP system telephone. Your system administrator will connect the tele-