[NTSysADM] vlan on single port

[J- P]

Hi all
i have a client that is setting up a new office with voip and naturally I'm 
recomending seperate drops and a seperate switch (small office < 30 users) 
,however , as most clients, they dont want spend anymore money than they have 
to, so they want to piggy back the computers to the phones ethernet port . Is 
it possible to vlan off the same drop/port ?