AT&T SYSTEM 25 User Manual page 31

Last Number Dialed (Continued)
Redialing a Telephone Number
1 Lift handset, listen for dial tone.
2 Press
28
Note
If you dialed the last telephone number with
any of the following buttons, you must use
the same type of button to obtain dial tone
before you redial.
For example, if you used
the last number, you must select
again before you press
to dial