sockadeblue

Hello all, i recently took a job where i would be supporting a merlin phone system, i am trying to determine which one i have and how i can add more ext. it says merlin 511a on the side of it. We are running 3 backplanes that are completely full of cards. some 008's and a few 016's. i cannot add another backplande because there is no room on the wall, the mounted the 3rd one all the way to the corner. I assumed the best way to achieve more ext. is to swap the 008 cards for 016's can anyone tell me what obstacles i am going to run into doing this, i know i will have to renumber the extensions, i assume i can use the spm software to do this, will i have to renumber all the extensions or just the ones in the card i am going to swap???