I oversee a network of about 350 network devices, all on a single subnet (172.16.x.x/255.255.252.0). We currently use an ANCIENT Nortel Norstar telephone system and are looking at upgrading very soon. We will need about 150 phones immediately with the option to grow to double that if needed. Obviously, I don't want to add 150-300 more devices onto the same subnet for bandwidth reasons. How do most people go about configuring their VoIP networks? We were looking at a ShoreTel system if it makes any difference.....Could I just have the ShoreTel system hand out DHCP info on a completely different subnet, like 10.0.0.x/255.255.255.0? Is there any need to have the two subnets even talk to each other? Also, is there anything that needs to be done on our Firewall to allow incoming and outgoing calls If the Shoretl server is in house? Thanks in advance.