Remote Phone Book Update

[SharEng]

We have an xml remote phonebook. Can this update itself without having to hit "update" or any other buttons.
The receptionist is, from time to time, updating the xml file when changes occur. We would like this update to roll out to the phones automatically.

When I read the manual it said that every time you click the phone book it grabs the new file, but it does not. I have to hit the update button for the changes to show.

We are using the T42s
Thank you for any information