An operator-assisted call is one in which the calling party places a telephone call which requires an operator to provide some form of assistance in completing the call. This may include telephone calls made from pay phones, calls placed station-to-station, person-to-person, collect, third number calls, calls billed to a credit card, and certain international calls which cannot be dialed directly.
Before the advent of emergency telephone numbers, operators identified and connected emergency calls to the correct emergency service. Directory assistance was also part of the operator's job.
Operator-assisted calls can be more expensive than direct dial calls.
A person-to-person call is an operator-assisted call in which the calling party wants to speak to a specific party and not simply to anyone who answers. The caller is not charged for the call unless the requested party can be reached. This method was popular when telephone calls were relatively expensive.
An operator-assisted conference call or op assist call is one in which the conference call is managed by an operator. The telephone operator will greet each calling participant, gather specific information from each calling participant, introduce key speakers, and manage questions and answers all from the telephone.
Station-to-station is a method of placing a telephone call, with or without assistance, in which the calling party agrees to talk to whoever answers the telephone. With the introduction of direct dial telephone service and the subsequent drop in the price of long distance telephone calls, person-to-person service is virtually unheard of. Fax machines and modems, due to their inability to ask for a party by name, use the station-to-station technique.