Callback (telecommunications)

Callback called in telecommunications a method (callback German for English). Mediated the caller of the telephone conversations by a service provider, the network provider of the telephone line is not, by means of recall.

The connection of communication-related connection between caller and service done here - unlike call-through by the service provider. The participant requested to do so offered either by a short selection ( "ping- call " ) or online via a web browser, SMS or a mobile phone software on the link, then the provider of the participants on the agreed callback number of the telephone line from which this would make calls, calls back.

Callback is particularly interesting when the termination charge for call termination on the caller ( A-subscriber ) is substantially lower than the connection rate, which is obtained in a call set-up by the A - participant ( in the past often by special interconnection agreements by foreign callback party for German mobile lines used, with domestic German suppliers especially through special free internal call forwarding of incoming calls to fixed -line numbers of the Home zone products ( "Federal Home zone" ) ).

Web -based telephony

Callback will for some time by the so-called " web-based ", "web -enabled " or " browser-based " telephony providers such as Jajah and PeterZahlt increasingly user beyond the former rather technology -savvy user group and beyond of mobile communications. This is done in contrast to the classical Webtelefonie ( using VoIP softphones such as Skype ) just entering the phone number (s ), the connection request and optionally the User Account Management online via the Internet, while both the conversation feed by the A subscriber as well as the scheduling for the B - participants occurs via the conventional landline (via callback ) and only the long-distance switching of the compounds is possibly carried out via IP telephony technologies.

Online dial-up connections

Callback is also used to authenticate users of on-line dial- in security-sensitive areas ( eg access to the corporate intranet ).