a friend of mine is using a vpn-site-to-site connection via his local Cisco ASA 5505 to a remote partner's Sonicwall (i'm not sure what the model is but it's one of the newer ones) to connect to their Fonality PBX server. How do i go about optimizing and prioritizing traffic for VOIP/SIP? From my understanding, I believe QoS needs to be configured for both end-points. So with the above network setup, what's the best way to configure?
10 sip phones <==> Cisco ASA 5505 <==> VPN site-to-site (over Verizon DSL) <==> Sonicwall <==> Fonality PBX Server.
Thanks in advance.