Multiple registrations one number sip forking for Series

We would like to introduce 3 sipphones with autoprovision method to one extension number. 
However, after assigning a number to the first phone, the extension number is removed from the selectable list. 
Can the same extension number be created as the number of IP Phone Concurrent Registrations?
For example, the hotel bathroom phone, the bedside phone and the rest room phone will all be the same number. 
How can we do it with the Autoprovision method?


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