I added another router to my network to handle the kids wireless devices, PCs, and IP phones (Aastra)
Since my main router provided by ATT doesn't support routes I had to add the routes manually.
I add 1 for my windows box so I could administrate device on the new network.
I had to add a new route on my Asterisk box so it could find the phones.
The main network is 192.168.1.0 and the new network is 192.168.2.0
Centos:
edit the following file. Changing the last part to match your network device name: eth0, eth1, etc.
nano /etc/sysconfig/network-scripts/route-eth1
default 192.168.2.0 dev eth1
192.168.2.0/24 via 192.168.1.1
Windows:
Open cmd prompt as administrator:
route add 192.168.2.0 mask 255.255.255.0 192.168.1.1 metric 2