Everytime we trunk VLAN-s on any of HWIC-4ESW ports, problems like VoIP conversation get disconnected very shortly after being established, VPNs that get routed through those virtual, VLAN interfaces on that router don't get established, there are a lot of packet losses etc.
The router we just tested today is Cisco ISR 3845, with c3845-advipservicesk9-mz.124-11.T1 IOS.
When we put that port on access mode everything works fine.
We would very much appreciate your help and experience,
Dardan