display sys cust", on a CM 4.0.1 switch:
Page 3: bottom right: "DS1 MSP?"
Page 5: top right: "Station and Trunk MSP?"
From what I remember, you need AVAYA maintenance to have AVAYA enable these for you. Or you need to make friends with your AVAYA Business Partner. The "dadmin" login can busy/release without MSP's.
Mitch