Automatic way to merge multiple Contact.xml files

[tsukraw]

Just throwing this out there.
Does anyone have a way or know a way to merge multiple xml contact lists together into one that could be scheduled task?

Reason for my question.
Have a location with multiple 3CX installs.
3CX auto generates a yealink_phonebook.xml for each location listing the extensions of that location.

Would like to take all those locations yealink_phonebook.xml merge them into a master_phonebook.xml and have the phones point to that for there phone list instead of separate phone books for each location.