OK,
then let's say vlan data is vlan-id 100 and vlan voip is vlan-id 200 try
set port vlan ge.2.5-10 100 modify-egress
set vlan egress 200 ge.2.5-10 tagged
With "show vlan portinfo port ge.2.2-10" you can see the configuration but this command is not availabe on older EOS-Systems like DFE-Chassis.