Telephone is a telecommunication system which provide communication through conversation.
Pulse is a unit of conversation duration through telephone connection. Telephone Subscriber is any person or institution who subscriber telephone services. If a person or an institution who subscribes two telephone line is considered as two subscriber. Paid Connection Telephone is a telephone line utilized by subscriber which has to be paid based on phone used. Official Connection Telephone is a telephone line utilized for company operation itself and public service operation such as public payphone and telecommunication shop.