SIP Traffic over VPN
So I'm trying to determine the best way to set this up, I've got two TZ300 firewalls and a FreePBX Appliance at the main site, this is for a residential setup.
We've got about 8 phones at the remote site and then the phone server hosted at the main house. There's a site to site VPN created between the TZ300s.
Recently they've started to complain that when calls are made to the outside world the remote party is complaining that the audio is choppy. This setup worked fine for about a year and a half then something happened and now there is call quality issues.
Is there a way to see how much traffic is actually traversing over the VPN? I'm wondering if it's a bandwidth issue as the site where the Phone Server is located has limited upstream bandwidth. They are also accessing some other resources over this VPN connection. So I'd like to first see what the actual usage over the VPN is.
My second thought would be to implement some type of bandwidth control so that the SIP traffic takes priority over the VPN connection. The main site doesn't seem to have call quality issues and it's only the remote home.