Panasonic KX-T7565 - Manual (Page 84)

Operation
84 User Manual
2.4.9 End-to-End DTMF Signalling (Tone Through)
DTMF signalling is required for access to special network services offered by some telephone
companies. This system allows you to signal the other end using DTMF tones during an established
call.
End-to-End DTMF Signalling (1)
End-to-End DTMF Signalling (2) (When "Automatic Hold — All Calls" is enabled)
PT
Enter required code.
required code
DTMF signal is sent to the other end while dialling.
During a conversation
PT
Enter required code.
required code
DTMF signal is sent to the other end while dialling.
During a conversation
Press Tone
Through.
(Tone Through)