So this is a strange one, some users in a remote office are complaining about one way audio on a wired network. Issue doesn't exist on wireless. Wired and wireless on are separate /24s but both take the same path out to the internet and have the same ACLs (/16) applied. If an end user changes (spoofs his MAC) they report audio works on the wired network. The only recent change was a new primary ISP but the voice provider doesn't filter on our source IPs so it should just work.
Colleague thinks its maybe an L2 MAC issue but I can't understand why that would be. Using a cat9k (16.8.1r [FC4]) at the core and a pair of PA 3020s on the edge. Co-worker seems to believe its local issue to a switch stack as well (3 x 2960 connected back to cat9k via 3 gig portchannel). Packet captures show packets coming and going from the edge back to the client machine but yet they still report one way audio.
Any ideas?
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