In some situations, the called party may number more than one: such an instance is known as a conference call. Strictly, in some systems, only one called party is contacted at each event, as to initiate a conference call the calling party contacts the first called party, then this person contacts the second called party, but audio is transferred to both called parties.
In a reverse charge (or collect) telephone call, the called party pays the fee for the call, when it is usually the calling party that does so.
If for some reason the call to the third person is not completed, or you decide not to add the third party to the call (for example, the person you want to talk with happens not to be in), depress the switchhook twice to resume your conversation with the person on hold.
Calls from phone numbers not contained on your list are sent to an announcement that informs the caller that you are not receiving calls at this time.
The Calling Identity on Call Waiting Feature, or Call Waiting ID, causes the identity of the callingparty in a waiting call to be displayed on your caller ID equipment before you put the first caller on hold, unless the identity of the callingparty is private or is unavailable for display.
The callingparty (also called caller, call originator or A-party) is a person who (or device that) initiates a telephonecall over the public switched telephone network.
The person who (or device that) answers a telephonecall is the calledparty.
The callingparty is usually the party that pays the fee for placing the call, however in reverse charge (or collect) calls this may not be the case.