I'm currently installing a couple of 3750 on a new building. Swicthes have to connect to Avaya's IP phones. Connected at 100 Mbps full duplex phones work OK, but whwn conected at 1000 Mbps (1Gbps) port, throuhg an 1Giga adapter provided by Avaya for phones, some phones are unable to connect to switch port (which remains down/down) an a few of them do not power up.
I have tried any combination on switch &phones autonegatioation and fixing speed and duplex. I ahve also checked cabling.
We get always the same results.
Is there any known issues between these kind of phones and 3750 switches?
Thx for ideas