I would kill for some decent QoS right now. Currently, I'm using an Asterisk server behind a Cisco PIX 515e running 6.3(4). The PIX is connected to a Cisco 2620, which is my T1 router. My VoIP provider is the same as the T1 provider, so when network traffic is normal, I have11ms ping time to my provider. However, when some idiot is downloading videos from CNN.com or something, my VoIP calls suffer greatly. I have 802.1Q working great on the local LAN, with my netgear switch. That's not my problem - the problem is obviously the T1 connection.
I'm looking for a way to throttle back all traffic besides the VoIP, which uses the SIP protocol. I'll be upgrading the PIX to version 7 next week I believe. From what I understand, version 7 may help with my problem - but my concern is that I'll need to upgrade my 2620, which is running 12.1. I'd like to upgrade the 2620, so I had the flash and ram maxed out - but I was told the 2620 can only go up to 12.3.
So, I'm looking for good solid suggestions on how to prioritize my SIP traffic using these devices - and if need be, I'm willing to swap out the 2620 with something more modern that will do a better job. Are there some commands I can use with IOS 12.3 and PIX OS 7 that will solve my problems?