Mimic Protected Port with private vlans?

[corey_costello]

Hi, 

I need to isolate ports in a vlan, ala "protected port" but I can't use protected port because it disables the multicast paging feature of the voip set. 

I tried to setup private vlans, but you can't create a router-interface under a private vlan, from what i understand. 

Is there another way to achieve sub-vlan isolation without private vlans or protected port?