Sony 500 User Manual

You can transmit dual-tone multifrequency (

DTMF) sig-

nals to control devices such as an answering machine 
or automatic information system. 

N

Press the key shown.

Select and confirm the option shown.

j

You can use the keys 

0 through 9, ) and ( 

to transmit DTMF signals.

*53=DTMF dialing?

Ending the call also deactivates DTMF suffix dia-
ling.
Your system may be configured so that you can 
start DTMF suffix-dialing immediately after set-
ting up a connection.