I am working with a mix of 2616, 2008, and 3903's. Is there any way that I can put a caller on hold on ext. 4444 and go to another phone ,hit pickup 4444 and get the caller? I tried using RNP and RNPG, but it will not work. Looked in the books and it said DNP will not work with the 3900's. Any help would be great.