The CPDC - Call Processor Dual Core card can be used as a stand alone signaling server, or a co-res signaling server and call server. Just cannot be a stand alone call server. The CPMG is usually all three on one card.
You should have a security dongle on the CPDC card for the call server portion.
It's all linux based now, unless you use the CPPM cards and have a High Availability setup, that is not supported on linux and only supported on the cppm cards.
your call server just runs on a vxworks emulator in a co-res environment, for the call server software (the pbx side if you wish)
I guess you could load the CPMG as a Media Gateway and a signaling sever. Make this your primary security server, your signaling server and your element manager. Then from this you can use deployment manager to deploy your call server and follower signaling server on the cpdc card. You could make the signaling server part of the cpdc a follower signaling server and nrs.
You can check the configurator reports on the order. this would be the excel spreadsheet the sales engineer had after the system was built in the configurator. it should let you know what applications they thought would be built on which server
it sucks because the documentation is somewhat vague when describing the linux base. there is great documentation on how to load the linux base but very little information on how to deploy the different applications.