Panasonic KX-TD612CE User Manual page 52

Operation
Changing the dialling mode from pulse to tone (Pulse to Tone Conversion)
To access services such as computer telephone services, Voice Mail, etc., that require a tone, you
can temporarily change the dialling mode from Pulse to Tone.
DPT/SLT
After the line is connected
#
Dial #.
52
desired no.
Enter desired number.
User Manual