I have been asked to add 2 phones to a 3000 and after some research I found I need to expand the base system. At present it is 4 x 8 with 7 digital phones and 1 analog conf phone. I have located the manual, the expansion back plane and the 0x8 expansion module. What I do not know or have is the programming software and cable or if I should just try to program via station 10. I am looking for suggestions program with phone or look for cable?