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1.2
Making a Call
There are names for the party being called and the party making the call.
When we make a call, one of the two parties must first dial to call up the
other party by the bell on its telephone. Making a call in this way, that is,
dialing is called the "outgoing call", and the call that arrives is called the
"incoming call".
When you lift the handset, the handset is "off-hook". When you hang up,
the handset is "on-hook".
These days, some telephones have an on-hook button. For example, even if
the handset is placed on the telephone body, pressing this on-hook button
sets the telephone to the same state (on-hook) as when the handset is
picked up.
Outgoing call
Fig. 1-3 Telephone Call State (1)
On-hook
Fig. 1-4 Telephone Call State (2)
BASIC OF TELEPHONE
Incoming call
Off-hook
1–3
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ït
çi
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