HA System installation2007 Nortel Software Communication System v1.0 Page 13HA System installationSelect the HA System installation option to install SCS in High-Availability mode. To install SCS in HA mode, perform the followingsteps.Note DNS SRV records are required for an HA system. If SCS is not running the DNS server, see Appendix B: Advanced DNS onpage 26 for details on configuring your DNS server.Installing the Master SystemAfter selecting the HA System installation option, you will be asked to setup two systems: Master and Slave. The Master System will beconfigured first. To configure the Master System, use Tab to place the cursor highlight over Master HA System (or use your mouse),and press Enter.You can configure DHCP, DNS, and NTP servers on the host. By default, all options are selected to be configured. You can clear anyor all of the selection options.1 To select or clear the following options, use Tab or your mouse to navigate among lines, and press Enter to select a highlightedoption. After you enter all information, press Tab to highlight OK (or use your mouse), and press Enter.• DHCP: Dynamic Host Configuration Protocol provides a full DHCP server with 12-hour lease time that is configured to deliverstandard IP information as well as TFTP and NTP servers (both servers are assigned to the SCS).WARNING: Enabling DHCP on a network with an existing DHCP server can cause issues with obtaining and using IPaddresses. Contact your network administrator if issues arise.• DNS: Domain Name Server enables the SCS to provide DNS information to network devices. The DNS also configures SRVrecords with the SCS as the signaling server.• NTP: Network Time Protocol used to synchronize the computer system clocks over networks.2 In the Network Settings dialog box, enter the requested information; use Tab or your mouse to navigate among lines. After you enter