Nortel Networks 1000S Manuale Utente

 Configuration options

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If the master (Leader) Signaling Server is unavailable, a Follower 
Signaling Server becomes the IP Telephony node master.

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Signaling Servers share telephone registrations (load-sharing).

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If a virtual trunk is unavailable, virtual trunk redundancy occurs (that is, 
the call-processing software selects an alternate route).

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Signaling Servers can be configured for different types of redundancy for 
their software components (for example, Alternate Gatekeeper, Failsafe 
Gatekeeper).

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If the Primary Gatekeeper is unavailable, you can configure an Alternate 
Gatekeeper (automatic database synchronization).

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If the Primary and Alternate Gatekeeper are unavailable, you can 
configure a Failsafe Gatekeeper (at each Signaling Server).

 illustrates the handling of a network failure with 

Survivable MG 1000S in place.