Using Touch-Tone Services (For Pulse Dialing Systems Only) - Sony IT-A2500 Operating Instructions Manual

TONE (#) key
ond,
!
You only need to TONE Use the phone to dial the service number.
once to tum dialing to tone; this :
will remain effective until the cali
is disconnected.
%
When connected to the service, press TONE (x).
G9
Press the dialing keys as required.