AT&T Definity ISDN 7507 - Manual (Page 39)

Priority Calling
To place a priority call 1 Press

Priority

(3-burst ring) or Dial Priority Calling Code [dial tone]
2 Dial extension
3 Wait for called party to answer
To change a regular call 1 Press

Priority

into a priority call
●
(3-burst) when you hear a
Called party receives a priority call waiting tone
call waiting ringback tone
(3-burst)
2 Wait for called party to answer
Note: If you still receive a call waiting ringback
tone, wait a few minutes and try again.