End-To-End Dtmf Signalling (Tone Through) - Panasonic KX-TD500CE User Manual

2.4 During a Conversation

2.4.8 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)
PT
During a conversation
required code
Enter required code.
DTMF signal is sent to the other end while dialling.
End-to-End DTMF Signalling (2) (When "Automatic Hold-All Calls" is enabled)
PT
During a conversation
(Tone Through)
Press Tone
Through.
74
required code
Enter required code.
DTMF signal is sent to the other end while dialling.
Operation