Panasonic KX-UDS Series Step By Step Installation page 47

6.1 PS Registration Notice : It might take few minutes to do handover
There is a case, it might take few minutes to be able to handover after PS registration
operation except CS1 and registered CS. The reason of this is that CS1 transfers PS
registration information to each CS one by one after finishing registration procedure
with other various data sent/received between CS1 and each CS.
It takes 5 minutes as maximum.
This period doesn't depend on the number of CSs or number of PS registering at the
same time.
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