Aich check this out, so you want to open a room via an url link,
First you need to open the room and find out the room number, in the room click on File, then on Show Room Statistics, then on the pop up window next to where it says Room number: the is the room number.
Then do this in the link format
paltalk://groups/Room Number
This is an example paltalk://groups/56702 that will open some gypsy room 🙂
Then a pop up windows should open asking to open the Launch application paltalk program, aigh thas it you can add this I guess to your site so it opens paltalk and the people will go directly to your room 🙂