[cisco-voip] Switch replacement causes one-way audio?

[David Sullivan]

cisco-voip-bounces at puck.nether.net wrote:
> This past weekend our network team replaced some aging 4006s
> with 3750 stacks.  Since then we've had users complaining
> that callers on the far end cannot hear them.  Our first
> thought was to hard code the switch-port to 100/full (we're
> using 7960Gs) - and that didn't seem to help.

Never ever do this unless you hardcode both ends. A better idea is not
to do it all, devices get moved around and it will just lead to aggro
for someone later on. Hard setting speed and duplex probably causes more
problems than it solves these days.

> 
> Does anyone have any ideas on what we could check before opening a
> TAC case tomorrow? 

Arp inspection or dhcp snooping on the 3750 gone awry? Try turning those
off and seeing if this resolves it, otherwise it could be an ACL
somewhere. Are calls between two phones on the same subnet ok?

David Sullivan
IT Services Systems Team
Barnet College 
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