Client w/ 6.0 Mitel 5000 wants to add 6 PC Attendant Consoles. This is one node. Besides system oai and 3rd party what else do I need? Thanks.

I have an update for you. New CT Gateway from Mitel. You need a Multi App. The old version ran on XP and 2003. The new version from Mitel is 5.0 and MUST be obtained from a Mitel dealer.
CT Gateway Release 5.0 does not support redundant switch connections. Sites requiring integration with redundant Axxess CP Servers must continue with an older CT Gateway software release that supports redundant servers, e.g. CT Gateway Release 4.5.

Up to 99 simultaneous OAI application connections are allowed with the multi-application Mitel CT Gateway license