4.2.3.2 Automatic Rerouting to Secondary PBX
Description
If an IP extension loses its connection to its primary PBX, it can automatically reconnect to a specified
secondary PBX. The connection can be lost due to factors such as network outages or the PBX going offline.
When the primary PBX is available again, the extensions automatically reconnect to it.
Normal Operation Rerouted to Secondary PBX
The following types of extensions support rerouting to a secondary PBX:
• KX-NT300 series IP-PTs
• KX-NT500 series IP-PTs
• KX-UT series SIP phones
• SIP-CSs (S-PS)
Conditions
• Extensions must be preregistered at the secondary PBX. When you register an IP extension, you can
specify the site to use for the secondary PBX connection.
The secondary PBX must contain the same type of card to which the extension is registered at the primary
PBX.
• Each IP extension that uses this feature requires 2 ports: 1 at the primary PBX and 1 at the secondary
PBX. Therefore, the total number of individual IP extensions that can be connected to the system is
reduced.
• To continue to provide Unified Messaging service, a mailbox can be created at the secondary PBX with
the same number as the one on the primary PBX.
• Even if the primary PBX becomes available again, an extension will not reconnect to it if the extension is
on a call.
If BGM (® 2.28.1 Background Music (BGM)) is being played through the extension while it is connected
to the secondary PBX, it will not reconnect to the primary PBX when it becomes available.
352 Feature Guide
4.2.3 One-look Networking Survivability
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