We have a Fonality phone system. The phone server is located at our main office on a 192.168.23.x network. The phones there have no issues. The data network at the main office is 192.168.22.x.
I am in our other location. We have a site to site VPN in place using SonicWall appliances. Here our data network is 192.168.29.x and our phones are 192.168.30.x. Occasionally our phones will stop working and display a "no service" error. Not all of them stop working at the same time but eventually they all have stopped working at one time or another. It used to happen only once a week or so and now we've had it happen several times in a day.
Our data network used to lose connection when we first set up this office (about a month ago) but after I changed the DNS config our DHCP server was handing out to point only to our DC that stopped and now it's only the phones having issues.
Any ideas guys?
Thanks in advance for helping with this.