AT&T 1412 - Manual (Page 26)

Te m p o r a ry Tone Dialing
If you have dial pulse (rotary) service, you can change
from dial pulse to touch tone dialing during a call.
1 Make the call and wait until it is connected.
2 Press . Keys pressed after this send
touch tone signals.
3 After you hang up,the phone automatically
returns to dial pulse (rotary) service.
2 3
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