VLAN Tagging

[dphills]

We have a small office with a Fortigate 90D with no switch.  We are deploying VoIP phones.  Normally, we would plug devices into a switch, where a port is configured to segment/allow both a voice vlan and a data vlan.  This is called VLAN tagging (not trunk port).  

Is there a way to setup a port on the Fortigate 90D to allow VLAN tagging.  The configuration would allow me to plug in a VoIP phone and have the PC piggyback off the back of the phone.  

Thank you in advance.