A Conference call is defined as a phone call that usually connects three or more people simultaneously. This service is often utilized by companies to communicate with one or more of their key personnel at the same time, usually to get input from all involved or to disseminate information needed by more than one person at the same instance. Conference calls have proven to be an effective and cost-effective mode of keeping in touch with multiple people around the world. With costs in travel being cut to a minimum and conferencing costs at a fraction of the amounts needed to fly to meetings and what-not, Call Conferencing has become the norm these days in terms of company cost efficiency.

Conference Calling was originally facilitated via a telephone. The most recent version of this is the internet based conference call that is done via internet telephony. These two means of conference calling can be facilitated by Conference Call Service companies. Usually, in call conferencing, some companies have to employ their own conference call service equipment, which can be pretty expensive. Employing a Conference Call Service Provider, whether it be telephone or internet based, also further reduces cost incurred by the company that uses this technology.

Conference Call Service companies provide the hardware and the services for the company who wishes to contract their help. In the older style conference call using the telephone as the medium of communication, there are two ways to get the conference call service, namely the reservationless and the operator-assisted services. The Operator-assisted service is, as the name denotes, facilitated through an operator. This is used mainly for interconnecting quite a number of participants to a conference call and is usually arranged or "reserved" a day ahead of the scheduled conference or meeting. The reservationless conference call service is oftentimes less expensive and subsequently, more popular than the operator assisted mode of tele-conferencing. This conference call service is reservationless due to a toll-free number that is assigned to your company which you can dial at anytime, without making any "reservations" or advance notice.

Telephone based conference call service providers also classify their services into two sub-services, the broadcasted conference and the question-and-answer conference. The broadcasted conference call is just as it is named, a broadcasted call that reaches multiple receivers who only get to listen to the caller talking and no interaction is possible or questions cannot be thrown at the speaker since the exchange is one way. The question and answer conference on the other hand is just that. A question and answer situation where the participants can lobby questions and answers at each other to come up with resolutions to certain topics that are being discussed. Traffic for this kind of conference call is controlled via a button that a participant presses to alert the others that a question or an answer is coming up.

The newer trend in Conference Call Services is the VoIP based services or Voice-over Internet Protocol based Conference Call Services. Also known by the term Web conferencing, VoIP based services makes use of an internet service provider and has quite a few options in the bag as compared to the original call conferencing choices afforded by the telephone based variety. This type of call conferencing is often useful when visual aids and projection charts need to be shared with the people on the other side of the line.

Some of the most common Web conferencing activities include slide presentations and application sharing. A person on the other side of the globe could present facts and figures with the help of this computer based program that is accessed via another program that enables the other parties to see the explanation as well as hear it over headphones or speakers. Application sharing can also be used by multiple parties, with the participants having the option to manipulate an open application, like a spreadsheet, on the presenter's unit utilizing software that allows this.

Call conferencing via VoIP is also useful for video-conferencing or a call conference enhanced with the use of web-cams. This can be useful for construction firms that are global. They can view the progress of a site that is far from headquarters by sending one person with a laptop and a web-cam to the site and broadcasting this to the people involved in the project along with voice commentaries and observations.

Conference Call Service Providers are multiplying in number, each one offering similar services to one another yet one or more presenting either an expansion or enhanced version of one or more services offered by the other. At times, the prices of these services becomes the point of contention for these rivals in business, where one company provides the same service at a lower price than its competitor.