Panasonic KX-NS1000 Feature Manual page 32

2.1.7 Automatic Rerouting to Secondary PBX
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IP-PTs and IP-CSs (KX-NS0154 only) monitor the connection to the PBX themselves. Therefore, these
extensions can switch back to their primary PBX even in isolated mode where Slave units do not
communicate with each other.
A KX-UT extension cannot switch back to its primary PBX in isolated mode. For a KX-UT extension to
reconnect to the primary PBX, both the primary PBX and secondary PBX must be able to communicate
with each other through the Master (or Backup Master) unit.
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The secondary PBX for a KX-UT extension must be on the One-look network. The secondary PBX for
IP-PTs and IP-CSs (KX-NS0154 only) may be connected via a QSIG network. In this case, the secondary
PBX settings are configured on the extension only; no programming is necessary at the primary PBX.
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If the Master unit has gone offline, extensions cannot reconnect to it until it has been returned to normal
operation.
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For IP-PTs, the IP address of the secondary PBX must be programmed manually. For details, refer to
"5.8.1 Assigning IP Addressing Information" in the Installation Manual.
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If a secondary PBX is specified for an IP-CS (KX-NS0154 only) and the IP-CS's Announce Mode setting
is enabled, it can send the secondary PBX information to other terminals on the same remote local network
instead of the PBX. However, only KX-NS0154 IP-CSs support this feature.
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All IP-CSs (KX-NS0154 only) in a synchronization group must be set to the same primary PBX and
secondary PBX. However, the synchronization settings (e.g., the synchronization group, master CS) can
be different between the primary and secondary PBX.
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Registration of extensions must be performed at the primary PBX.
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Even if an extension is on a call using P2P, if it changes its connection from its primary PBX to its secondary
(or back), the call will be dropped even though the call is not routed through a PBX. (® 15.1.5 Peer-to-Peer
(P2P) Connection)
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For KX-UT extensions, the IP addresses of the primary PBX and secondary PBX are downloaded from the
PBX. Specifying the host names of sites to be resolved via DNS is not recommended.
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Activation keys for IP extensions (excluding IP-CSs) are necessary at each PBX that will accept secondary
connections. However, an activation key is required only when an extension actually connects to the PBX,
and the activation key is released when the extension reconnects to its primary PBX. Therefore, it is
necessary to have only enough activation keys for the number of extensions that will connect at any one
time.
32 Feature Manual Document Version 2016-03