I have a couple of Cisco 515e PIX firewalls with vr 7.2 of the PIX software, which supports QOS through a VPN. I have QOS configured but am having issues with VOIP calls being dropped and sounding really broken up. Someone has told me that I need to change the QOS paramaters to fix the issue, however I don't see how that could be the issue.
My question which I can't find a good answer too at the Cisco web site (or anywhere else on the net) is simply this... If I configure QOS that only applies on the inside interfaces of both Pix's and it will have no effect on the actual tunnel trafic just on the tunneled traffic at either end right?
I think the whole idea of VPN through an internet connection will never be able to reliably deliver voice unless the ISP has some private network that they can control.
Any thoughts or documentation on this issue would be appreciated.