The host or hostess.
a person whos addicted to material things and whos stupid and is taciturn.
An orphan.
party animal
You could call them a party animal. The life and soul of the party opposed to a party pooper.
Party Pooper
You could call them a party animal. The life and soul of the party opposed to a party pooper.
The Host
You would call them a "person" or better yet, call them by their name.
Guest of honor
Host
Andrew Furr
If I understand your question a posed, the following answers apply: 1. The "calling party" is the person/phone who/which initiated the call. 2. The "called party" is the person/phone who/which answered the incoming call.