Service Desk Call Categories

I am implementing my 3rd Service Desk each one has been from a seperate vendor. I am trying to convince my client of a way of call categorisation and priorities that i have determined. This has led me to maybe question my categorisations and priorities.

Would anyone be willing to email me a spreadsheet of there service desk categories and call priorities. This will either confirm my approach or throw it in the air, either way i would appreciate the assistance from fellow proffesionals.

My email is jb9_2000@yahoo.co.uk please use email subject of HD CALL CATS.

Thanks to all.