I had this phone system passed on to me as I took a new job, and I am quickly learning a lot about it however I am struggling to figure out an issue.

We have a two Cisco RV320 creating a VPN tunnels between offices, and trying to configure the remote phones to hit the local SIP server.

I can ping back and forth across the network

The Local Cisco Router 10.1.10.1
The Remote Cisco Router is 192.168.3.1

The local SIP server IP address is 10.1.10.112

The remote phone is setup as the following

IP 192.168.3.155
Subnet 255.255.255.0
Gateway 192.168.3.1

SIP IP 10.1.10.112

It is getting SIP server not found error

Any IDEAS?