I have a weird problem. My Cisco Small Business SG 300 switches don't play nice with our Allworx Sip phones. The quality is downright bad. If I first connect the phone to another switch (adtran Nvanta) or dumb netgear unmanaged switch then the call quality is just fine. As the traffic is passing through the cisco eventually I don't understand why the quality improves.
Anyone have any ideas on how to solve this problem?