When you created the VLANs dis you add media-gateway ip primary to the subinterface facing the SIP server?
I am very green when it comes to phone systems, and subnetting. By subinterface are you taking about the Cisco managed switch or the Netvanta switch? On the Netvanta I am assuming this is done under Data/IP Interfaces? Here I have 2 entries eth00 and default. Eth00 is set to dhcp and primary. default is set to the static IP address of the netvanta device.and primary.
For a better breakdown of the topology
Sonicwall to Cisco managed switch vlan 101
Cisco managed switch to vlan 112(phone and computer subnet)
There are also 4 other vlans connected to the Cisco switch. I am having no other issues than the analog phones.
I now have the phones working. The problem was that the fxs ports were not assigned user accounts and extensions. Which makes me wonder how they were working before the subnetting. I just plugged them in and they worked. Unless the accounts were removed by someone when we did the subnetting. But I did not see anyone remove them.
Thank you for your help.