This is a fun oneevo22 said:
now this ip addressing sceme will waste alot of ip addresses but it will be easy to set up and functional. If you want I can do some serious subnetting for ya but this should do:
for the network with the phones use the 192.168.1.xnetwork and for the development server just use the 192.168.2.x network. use the 255.255.255.0 subnetmask.