That sounds like what the phone companies here in Europe call "Hot Lining".If you had a telephone on a line like this,the phone company programs it at their end to dial a requested number.I have a site where this was done on their KoneXion units and it doesn't work.I also have a site where a Windcrest unit was changed to a hotline and it didn't work after they did it.(I would have changed it to whatever number number if they asked.I ended up changing the hotline setting).I don't know about KRM's in regards to hotlining on this side of the pond.