Panasonic KX-NS1000 Manual page 369

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While connected to a secondary PBX, any call charge information for an IP-PT is collected at the secondary
PBX. This information is not merged with the primary PBX's data when the primary PBX becomes available.
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Call history information (incoming call log [® 2.19.2 Incoming Call Log] and redial [® 2.6.3 Last Number
Redial]) for IP-PTs is not transferred to or from the secondary PBX. Therefore, when the extension connects
to the secondary PBX, call history information accumulated at the primary PBX cannot be accessed, and
any call history information accumulated at the secondary PBX cannot be accessed once operation returns
to the primary PBX.
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IP-PTs and SIP-CSs 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 SIP-CSs 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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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. (® 5.2.3 Peer-to-Peer
(P2P) Connection)
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SIP-CSs that are connected to the same primary PBX must all have the same secondary PBX setting.
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When a SIP-CS has switched its connection to the secondary PBX, there might be a slight delay when
making calls from an S-PS.
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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 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.
4.2.3 One-look Networking Survivability
Feature Guide 369