Automatic call back under control of a telephone terminal

Details Automatic call back under control of a telephone terminal Automatic call back under control of a telephone terminal

H - Electricity

04

M

H04M 3/48 (2006.01) H04M 1/247 (2006.01) H04M 1/2745 (2006.01) H04Q 11/04 (2006.01)

Patent

CA 2159383

Telephone terminals directly implement an automatic call back feature by establishing a logical channel between two telephone terminals when a callingtelephone terminal is unable to complete a call to a called telephone terminal. Via the logical link, the called telephone terminal communicates to the calling telephone terminal any change in state that is related to its ability to receive a call. When both telephone terminals are idle, the calling telephone terminal recalls the called telephone terminal to set up a call. The logical link is established on user-user temporary signaling or D channel facilities of ISDN links. Since the interconnecting networks are not part of providing the automatic call back service, the telephone terminals can be interconnected by any combination of telephone networks that provide ISDN service.

Des terminaux téléphoniques exécutent directement une fonction de rappel automatique en établissant entre eux un canal logique lorsqu'un terminal appelant est incapable d'établir la communication avec un terminal appelé. Par l'intermédiaire de la liaison logique, le terminal appelé communique au terminal appelant toute modification d'état liée à sa capacité de recevoir un appel. Lorsque les deux terminaux téléphoniques sont inactifs, le terminal appelant rappelle le terminal appelé afin d'établir la communication. La liaison logique est établie sur des installations RNIS à canal D ou à signalisation temporaire utilisateur-utilisateur. Comme les réseaux d'interconnexion ne contribuent pas à la prestation du service de rappel automatique, les terminaux téléphoniques peuvent être interconnectés par toute combinaison de réseaux téléphoniques assurant le service RNIS.

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