AT&T Classic Mail Voice Messaging System - Manual (Page 20)

For example, to enter a Y, you would press 9 and then
press 3 to specify that Y is the third letter on the 9 key.
If your last name consists of fewer than four letters, you
just enter the letters needed.
For example, if John Simon wants to enter his last name
he follows these steps:
1.
2.
3.
4.
For the first letter press 7 3
CLASSIC MAIL system’s recorded voice responds “S.”
For the second letter press
4 3
CLASSIC MAIL system’s recorded voice responds “I.”
For the third letter press 6 1
CLASSIC MAIL system’s recorded voice responds “M.”
For the fourth letter press
6 3
CLASSIC MAIL system’s recorded voice responds “O.”
CLASSIC MAIL System Mailbox User Guide