NEC Univerge sv8500 Manual page 2371

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26.1 General

IP terminals in offices of an enterprise normally work under control of a Telephony Server in a main office: the

Telephony Server can maintain all terminals' operations via an IP network, even if some of them are in other

offices. It is one of flagship features of our Telephony Server. But what will happen if a failure occurs on the

network or Telephony Server? The Telephony Server will lose control of the terminals in its (main) office as

well as ones in other offices depending on the failure - it is a big problem. That's when an SR-MGC(S) really

comes into play: Terminals re-register to an SR-MGC(S), which is arranged in advance, so that they can keep

working under control of the SR-MGC(S). While the SR-MGC(S) operates, the SR-MGC(S) is checking if the

Telephony Server recovers from a network failure or something. If detecting the recover, terminals under con-

trol of the SR-MGC(S) register back to, and work under control of the Telephony Server; the SR-MGC(S)

switches its operation to standby in case of another failure on the Telephony Server.

For Service Conditions for SR-MGC(S), refer to "Survivable Remote MGC [S-141]" of Data Program-

ming Manual - Business. For Service Conditions peculiar to SR-MGC(S) with Location Diversity, refer

to "Location Diversity [L-55]" of Data Programming Manual - Business.

The following is a configuration example.

e.g. A Telephony Server in a head office normally controls IP stations in branch offices. Suppose that a failure

occurs on a network or a network device, and which causes the Telephony Server to lose control of stations

in branch office (BO) 1; an SR-MGC(S) in BO1 starts controlling the stations.

in Operation Mode

-OPERATION- T x/Rv

in Standby Mode

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