2.2 Programming16 Programming GuideGatekeeper SettingsParameter & Description Default Value Range# GatekeeperSpecifies the use of a gatekeeper.For details, refer to "Detailed Explanations".Don't use Use,Don't use* Primary Gatekeeper IP AddressSpecifies the IP address of the primary gatekeeper.192.168.1.3 The following addressesare invalid:• Class D addresses• Class E addresses• Loopbackaddresses* Primary Gatekeeper Port No.Specifies the port number of the primary gatekeeper.1719 1 to 65535* Secondary Gatekeeper IP AddressSpecifies the IP address of the secondary gatekeeper.Set this parameter when setting up a secondary gatekeeperas a redundant backup system.192.168.1.4 The following addressesare invalid:• Class D addresses• Class E addresses• Loopbackaddresses* Secondary Gatekeeper Port No.Specifies the port number of the secondary gatekeeper.Set this parameter when setting up a secondary gatekeeperas a redundant backup system.1719 1 to 65535* Gatekeeper Connection Checking Interval (min) 0-1440minSpecifies the time (in minutes) between periodic checks ofconnection to the gatekeeper.When the primary gatekeeper fails, these checks can detectthe failure. In this case, the connection automaticallyswitches to the secondary gatekeeper if it is available, so thatthe network remains functional.0 0 (disable),1 to 1440* Call Signaling ModelSpecifies whether to carry out a call control (H.225) processdirectly between the cards or through a gatekeeper.Direct call control is typically preferred because it involvesless network load.Direct Direct,Routed (viaGatekeeper)