1.
Pick up the handset you wish to call from
2.
Dial *42.
3.
If the other telephone is engaged, you will hear a busy tone. If
available, it will ring.
1.
To pick up an incoming call to the other phone,
pick up a handset
that is not ringing.
2.
Dial *81#.
3.
The call will be answered on the handset.