TA Triumph-Adler DC 2435 - Manual (Page 168)

Setup and Registration
6-20
2 The machine will then ring using the predetermined
ring pattern.
When the call is from a telephone
Lift the handset and speak with the other party.
When the conversation is over, fax reception can
be initiated manually.
When the call is from a fax
Once the ringing tone stops, fax reception will start
automatically.