VOIP through VPN, QOS issues.

[ChrisDavis]

Hi Everyone,

I'm hoping someone might have some insight into the problem we're having. We have multiple sites connected with a VPN to our main site (hub/spoke). Everything works well with this connection except for VOIP and Video using Microsoft's OCS. Video conferencing experiences dropouts in the video.

looking at the OCS logs I think it might be an Untangle/VPN issue. We've tried setting up QOS rules in Untangle but it seems that by the time QOS sees the data it's already been processed into the VPN stream (thus and QOS rules applying to SIP aren't tiggered).

Any ideas as to how to identify the source of this issue and troubleshoot?

Thanks for your time and consideration.

[dmorris]

I think this is true. QoS runs on WAN interfaces (not the tunnel interface) so by the times the QoS rules are evaluated it sees the encrypted tunnel. You could try prioritizing port 1194 (the VPN traffic)

[ChrisDavis]

Thanks for the reply. You would have any ideas as to how to prioritize within the VPN tunnel? I've been trying to figure out a way using only one Untangle box, maybe with the "racks" concept within Untangle, but I haven't figured anything out yet. Otherwise I was thinking either with additional untangle or maybe a pfsense to first do prioritizing then have the data hit the original untangle.