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Chapter 23 ZyStack
Figure 187 ZyStack - Active Mode
When one of the X6004 fails, then its backup X6004 services the SIP clients that used to
connect to the X6004.
The backup can not, however, recreate extensions created for the analog phones on the X6004
that is down, nor can it recreate the outside lines via the FXO ports. FXS and FXO links are
physical connections to an X6004 and can't be duplicated by a backup X6004. FXS extensions
and FXO connections must be recreated in order so that they can be used again.
23.1.3 ZyStack Failover Mode - Standby
In standby mode, one of the X6004s does not actively participate in the processing of phone
calls. It only gets involved in case of a break down on one of the X6004s. When a member of
the ZyStack breaks down the X6004 that was on the sideline is ready to take the place of the
downed X6004. In this failsafe mode, all of the X6004s have the same copy of the
configuration. The X6004 that was standing by, is able to replace the broken down X6004
immediately.
Figure 188 ZyStack - Standby Mode
Again, the backup can not recreate the extensions created for analog phones of the X6004 that
is down, nor can it recreate the outside lines via the FXO ports. FXS and FXO links are
physical connections to an X6004 and can't be duplicated by a backup X6004. FXS extensions
and FXO connections must be recreated in order so that they can be used again.
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