Those 2 items are "mutually exclusive". Take your 2616 phone and plug it in somewhere else and you'll see why. Unless you have auto set relocation, you will, indeed, change the display name.
Programming is stored in the PBX, possibly an "Option 11c". http://www142.nortelnetworks.com/mdfs_app/techdoc/enterprise/cs1000/M125_40/pdf/NQZHZWQH.pdf
Answers & Comments
Those 2 items are "mutually exclusive". Take your 2616 phone and plug it in somewhere else and you'll see why. Unless you have auto set relocation, you will, indeed, change the display name.
Programming is stored in the PBX, possibly an "Option 11c". http://www142.nortelnetworks.com/mdfs_app/techdoc/enterprise/cs1000/M125_40/pdf/NQZHZWQH.pdf
Start looking in the 70's for instructions.
Carl