I am in the process of buying a new telephone equipment for my office. I own a 0x32 5.1 Is there a newer software that supports VOIP. I will need to have VOIP to interconnect a few of my offices. I have been reading about Nortel's BCM 400 and it looks good. I will need around 30 phones ,30 voicemails. Is this the right product for me? Any idea of how much it will cost me? Thanks