Conference call

Conference calls are a much favoured working medium in the professional world. A teleconference interconnects several participants and allows the desired mutual exchange via conference call. This helps save time for in-person meetings as well as travel costs in the company. Conference calls by telephone can be made when there are three or more participants. While in principle the ISDN technology supports tripartite conferences thanks to two parallel voice channels, the so-called conference channels are required for conference calls with more than three participants or with other telephone technologies such as analogue telephony. This can be achieved within the telephone network or through a telephone system.

Basic functions for a conference call by telephone

Generally, two methods are used to set up a teleconference. In the dial-in method, the conference participants call a previously notified conference number at an agreed time. In the dial-out method, the teleconference participants are called and connected to each other. Depending on the underlying tariff model, the caller, the called or the organiser of the conference bear the costs partly or completely.


Generally, the following features are provided as basic functions during a conference call:

  • Adding more participants
  • Protecting the conference with a PIN
  • Playing recorded messages
  • Allocating moderator function
  • Muting participants
  • etc.

Conference calls and other options in VoIP

Due to the digitisation of telephony and the integration of the telephone into the IP world through VoIP, teleconferences now offer new options and possibilities, and are becoming more and more popular. Thus, conference calls can include video conferences or web conferences. This renders it possible to not only transmit the voice but also the video image of the participants. By means of web conferences, applications and screen contents can be shared as required. The desktop of the moderator thus becomes a kind of conference desktop. The moderator can show the contents of his/her desktop to other participants or activate the desktops of the other participants. Even the joint tasks within an application, such as editing a text document or a presentation, can be performed without any problem. Today web conferences can be conducted at any location thanks to mobile devices with internet access such as smartphones, tablets or laptops and intelligent cloud telephone systems with conference functions.


Further information

Voice over Internet Protocol (VoIP)

What is VoIP?

The Voice over Internet Protocol, also called IP telephony, is a method of communication for making calls over a broadband Internet connection as an alternative to regular calls made…

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