问题：

[多选]

You need to configure a new Company Catalyst 3560 switch for a VOIP-enabled office. 
Which  three statements are true about the voice VLAN feature on this switch？（）

A . The default CoS value for incoming traffic is set up to 0.
B . The CoS value is trusted for 802.1p or 802.1q tagged traffic.
C . PortFast is automatically disabled when a voice VLAN is configured.
D . The voice VLAN feature is disabled by default.
E . The IP phone accepts the priority of all tagged and untagged traffic and sets the CoS value to 4.
F . When the voice VLAN feature is enabled， all untagged traffic is sent according to the default  CoS priority of the port