What licensing/hardware is required to get SIP trunking to work with an IPK II?

I'm assuming I need the 4 SIP license pack from NEC part number 750893 ; the PVA card in the system is displaying the following stats

Code
 PVA Current Service Pack: SP01F 2006-06-12 11:25:54
PVA Installed Packages:
MG16 1.50 2006-08-01 13:08:34

 
Any help is appreciated.