STP problem with PC + IP phone connection on WS-C3750X-48P
I think that these messages are not really error messages.
It should be the normal behavior of spanning-tree when a port comes up (disabled -> blocking -> forwarding) and goes down. You can see, the severity level is 6 and 7, so these are debugging and informational messages and not errors.
Did you try to configure the speed/duplex with fixed values on the switch? Maybe the phone has a problem with auto sensing.
You can set the port as an fixed access port by using "switchport mode access". But I don't believe that this is the reason for your problems. It is only better config style ;-)
I can't test this because I don't have Alcatel phones here.
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