Panasonic KX-TDA100D Features Manual page 321

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If the status of a PS is set to Out of Range at all PBXs that it is registered to, the call will be redirected to
the overflow destination of the ICD Group.
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Handover from one PBX to another PBX during a conversation is not possible.
Feature Guide References
1.2.2.3 Outside Destinations in Incoming Call Distribution Group
1.30.6 Network ICD Group
Feature Guide 321