We have got some 2950s and 3500s switches which have got IP phones plugged in and are working fine. Ports are currently configured as trunks and voice traffic has been put into the separate voice vlan 222.. IP phones and the end PCs are correctly picking up their associated VLans..
I have just tried to put the ports into access mode and respecify the voice vlan as follows..
int fa 0/4
switchport mode access
switchport voice vlan 222
** we dont use any additional prioritization for voice on the LAN..
Anyway, once I make the change, the end PC picks up the correct native access VLan and works fine..
However, tHe IP phone loses registration with the call manager and just cycles on Configuring IP.. On full factory reset it appears that it now cannot pick up any IP address at all, so Im guessing the switch does not recognise the phone device at all and doesnt issue the correct voice Vlan ( 222 )..
As soon as I put the port back into trunk mode, everything is happy and the phone and pc pick up their correct vlans..
This is happening with both our 2950s and 3500s..
Has anyone had this problem or have any suggestions ??.. Probably something really simple I have forgotten !.
Thanks in advance...