NEC SVP SERVER - INSTALLATION SETUP AND Installation And Setup Manual

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NEC SVP SERVER - INSTALLATION SETUP AND Installation And Setup Manual Manual pdf 18 page image

2-2 SVP Server OverviewSVP Server Installation, Setup, & Maintenance Manual - Revision 1Multiple SVP ServersMultiple SVP Server environments are those which have more than oneSVP Server in the same subnet in order to accommodate largersystems and higher call capacity.In a system comprised of multiple SVP Servers using an IP protocol,a master SVP Server must be identified. The master SVP Servermust have a static IP address. The Wireless Telephones and the otherSVP Servers locate the master by using a static IP address, DHCP, orDNS. The loss of a non-master SVP Server does not significantly affectthe operation of the remaining SVP Servers. However, the loss ofthe master SVP Server results in a loss of all communication betweenall of the SVP Servers. This also means that the loss of the masterSVP Server results in the loss of all active calls and Wireless Telephonescannot check-in until communication with the master is reestablished.In a UNIVERGE WL System Telephony Gateway system using multipleSVP Servers, there is no “master” server.The Timing FunctionIn the UNIVERGE WL System Telephony Gateway environment, SVPServers provide the “timing” function for active calls. In multipleSVP Server environments, the active calls are distributed across theSVP Servers. In the IP PBX environment, SVP Servers provide both theconnection or “gateway” to the IP PBX for the Wireless Telephones andthe “timing” function for active calls. This “gateway” function isdistributed across the SVP Servers.In both environments, the number of active SVP Servers is determineddynamically. Whenever SVP Servers are added to or removed fromthe system, the distribution of “timing” function for active calls, as wellas the “gateway” function in the IP PBX environment, is affected.NOTEIP multicast addresses are used by the MH120 Wireless Telephone Push to Talk(PTT) feature. This requires that multicasting be enabled on the subnet used for theMobile Handsets, SVP Server, and telephony gateways.Routers are typically configured with filters to prevent multicast traffic from flowingoutside of specific domains. The wireless LAN can be placed on a separate VLAN orsubnet to reduce the effects of broadcast and multicast traffic from devices in othernetwork segments.