We connected an Aastra voip central to our network. When the Aastra central is configured to use Qos 5 in vlan 1790 (our voice vlan), we receive a lot of input errors and runts, so no communication is possible anymore. When the central is not configured to use qos everything is normal. I use the default auto qos voip trust settings, i tested it also without qos settings and still the same behaviour. We connected the central to 3750 catalyst switches.
Does anyone know why we receive runts?