Hi all, we have a problem with ip phones 7905, it seems that they only work in 10/half mode.
We have connected them to different catalyst switch (2950 and 2960), all in auto/auto configuration.
We observe many errors like this:
%ETHCNTR-3-HALF_DUX_COLLISION_EXCEED_THRESHOLD: Half-duplex loopback detected, collision threshold exceeded on FastEthernet0/12.
We have tried to force connection in 100full but into the phone appear a message "ethernet disconnected".
If we configure the port in trunk mode, then the phone work in 100full.
But for another problem (ip phone sw upgrade doesn't work), opening a tac case, a cisco engineer suggest us to not use trunk configuration for ip phones, and now upgrades work...