USING THE PHONE
-Press the 
/P key once as soon as you hear the dial tone. The previously dialled number will be automatically redialed.
4 - R BUTTON
These are used with the new services provided on digital exchanges. For details please contact your network operator.
NOTE: If you don’t use the provided services on digital exchanges, the R button only cut the line if you press it to dial a new number for example without replace the handset.
5 - MUTE BUTTON
If you wish to speak privately to someone else in the room without your caller overhearing press and hold the 
button. Your caller may still be heard during the MUTE operation. To resume normal conversation , release the 
button.
6 - STORING NUMBERS IN MEMORY
The Jupiter 20 can store upto 13 numbers of 20 digits each in the memories. Of the 13 memories, 3 are direct access by pressing M1, M2, or M3 keys. It is suggested you store the most frequently used numbers in these memories. The other 10 memories can be accessed by pressing the MEM key followed by digits 0 to 9 on the dial keypad.
To store numbers into memory :
-Lift the handset.
-Press the 
key once.
-Dial in the telephone number you wish to store into memory. The number 10