The calling party (also called caller, call originator or A-party or CgPA) is a person who (or device that) initiates a telephone call over the public switched telephone network, usually by dialing a telephone number.
The calling party is usually the party that pays the fee, if not free, for placing the call, however in reverse charge (or collect) calls this may not be the case.
Human call originator
In some countries, it is common etiquette for a call originator to identify himself first instead of the receiver, when the connection is established.
Machine call originator
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