If it is a vector you may need to change the announcement for that vector.
Display the vector and find out which announcement number you are using, then:
disp feature codes and find out your announcement access code. (it is on page one, ours is #05)
you have to be at a phone that is allowed to record announcmenets, to do this the phones cos has to have console permissions. (display cos) to find out which cos has console permissions
From that phone:
Dial the announcement access code (i.e. #05)
Dial the announcement number
press 1 to record
Hang up after recording