AT&T SYSTEM 25 User Manual page 39

Placing Calls (Continued)
Placing an Outside Call Using FACILITY or PERS LINE
1 Press
2 Lift the handset and listen for dial tone.
3 Dial the telephone number.
Activating a Busy-to-idle Reminder
1 Do not lift the handset.
Press
2
36
or
Your voice terminal will ring once when a
line is free.