Siemens 300 Series User Manual page 59

To reconnect to
the original call
Note
If you have a display telephone, the display notifies
you if the extension to which you are transferring the
call is in Do Not Disturb mode. If you do not have a
display telephone and the extension is in the Do Not
Disturb mode, the CBX calls you back after you hang
up. When you answer, you are connected with the
original party.
Before hanging up, press the CONNECT key to
rejoin the original call.
Using Your Phone 2–21