As long as you allow the set to page and are directing the page to external there is nothing special you need to do on the 450.
That being said, I've had 2 systems where the page jacks were defective. Since they were brand new, Nortel replaced the BFTs.
If it's out of waranty and you're good with a soldering iron, you could replace the jack yourself but it sure looks like a pain in butt to do it.