Windows License on ESXi

Hi,

Apologies if this isnt the correct place for this. Basically we are trying to sort out our licensing on our ESXI Cluster

We have 6 x ESXI Hosts with 4 Processors each (6 Cores)

Im being told by Software Provider that If I build a Windows 2008 Standrd Server and it has 1 vcpu and 1 core that I need to purchase a 4 processor license for it as its hosted an 4 Processor ESXI Host. Same can be said if I build a Virutal Machine that 4 vcpu and 6 cores i also need to buy a 4 PROC License,

Is your guys experience in this correct,

Any help greatly appreciated

Thanks