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In reply to Ölm:
I have read this thread through and many others, and I still don't have a clear answer on how to configure a QoS for VoIP over a site-to-site IPSec VPN connection.
You only can apply QoS rules to traffic leaving an interface, and you cannot apply QoS to traffic inside a VPN tunnel as it all looks like IPsec traffic. The following links to a thread discussing QoS and VPNs: https://community.sophos.com/products/unified-threat-management/astaroorg/f/54/t/39516
We have phone system and two locations. There are two Astaros used to connect two sites via IPSec VPN. VPN is used for both voice and data communication. The voice quality is poor.
What can I do?
If you know what's eating up the bandwidth, you might be able to throttle it leaving the internal interface on the receiving end.
In reply to BAlfson:
Astaro-1: Local network = VoIP1 and Remote Network = VoIP2
Astaro-1: Local network = Data1 and Remote Network = Data2
Astaro-2: Local network = Data2 and Remote Network = Data1