Saw a phone at a local retailer that had "Dial 9 For An Outside Line" how do I add that to my 79XX series of phones?
What does the status line currently display? If it says 'Your current options' then you have CUCM. If it says something like 'Cisco Unified CME' then you have CME. The former cannot be changed, the later is done with these commands:
system message "message"
reset all 1 <---resets all phones
wr <---saves config