We're running the latest version of Untangle 9.0.1. We have an Asterisk based phone system setup within our Untangle network. We have three remote sites using Untangle routers with OpenVPN connecting them to the main site where the phone system is located. The remote phones are connecting to the phone system over the OpenVPN.
The problem is that we are experiencing audio problems due to excessive jitter. The phones at the main location are fine, it's only the remote phones that are a problem. We have tried bypassing and QoSing the SIP ports but I've found conflicting information as to whether or not the QoS actually applies to data traveling over the OpenVPN connection. The router seems to indicate that it does not. However, the statistics recognize the SIP traffic and I can see that it has assigned it a Very High Priority. Once that didn't seem to be solving the problem, we install the Bandwidth Monitor and setup rules for the SIP traffic there to give it Very High Priority. In addition we added rules for other traffic that tends to use a lot of bandwidth and forced it to Medium. We did this on each router. We still continue to experience too much jitter which results in poor audio quality.
Has any one else had any experience running VoIP in an environment like this with Untangle or do you have any suggestions on reducing jitter? I was curious if switching to the new IPSec VPN would make any difference.
Thanks for any help!