Nortel Networks 1000S manual 42 of 44 Configuration options

Page 42 of 44 Configuration options

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

•Signaling Servers share telephone registrations (load-sharing).

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

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

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

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

Figure 7 on page 43 illustrates the handling of a network failure with Survivable MG 1000S in place.

553-3031-010 Standard 3.00 August 2005