You'll know if you have these...Link is a module that sits in the PBX, SLink is a server base soln...if you're onsite and looking at the PBX, remotely you're not going to know.
The Symposium will require package CCS100. You cannot order or buy MLink from Nortel anymore...
On the PBX you'll need AST license. Go to LD 22 and type SLT at the REQ prompt. Look for the line that say AST. Or, go to LD 23 and look at the LD header.
Your CTI integration will be utilizing the MLSM on the Symposium to communicate with the PBX over the AML