I have been making some test trying to transfer a call from a 5304 IP phone and i can't do it, i using the same COS as the 5320e and 5330e ip phones of course from these phones i can do the transfer and conference, but it is weird that from 5304 even i have already configured the trans/conf key maybe something is missing here really i don't think so but..., some advice you can give me?