Call interruption between two terminals by means of a call...

Details Call interruption between two terminals by means of a call... Call interruption between two terminals by means of a call...

H - Electricity

04

M

H04M 3/20 (2006.01) H04M 1/57 (2006.01) H04M 3/428 (2006.01) H04M 11/08 (2006.01)

Patent

CA 2210709

A method of interrupting a call established via an analog link between two terminals via a switching center, whether the call is telephonic, telematic or a combination of the two, comprises the transmission of a user alerting signal and a terminal alerting signal from the switching center to one of the terminals. Between these signals the call between the terminals is re-established. To detect the terminal alerting signal the terminal searches during a predetermined period for a pattern transmitted by the switching center comprising in succession a first silence signal with a power less than a predetermined power during a first predetermined period of silence, the terminal alerting signal, and a second silence signal during a second predetermined period silence.

L'invention est une méthode servant à interrompre un appel établi via une liaison analogique entre deux terminaux par un central, que cet appel soit du type téléphonique ou télématique, ou encore une combinaison de ces deux types, le central transmettant à l'un des deux terminaux un signal d'alerte destiné à l'utilisateur et un signal d'alerte destiné au terminal en question. L'appel entre les terminaux est ré-établi durant l'intervalle qui sépare ces deux signaux. Pour détecter son signal d'alerte, le terminal recherche durant une période prédéterminée une configuration de signal transmise par le central et constituée de la suite de signaux suivante : un premier signal de silence dont la puissance est inférieure à un niveau prédéterminé durant une première période de silence prédéterminée, le signal d'alerte du terminal, et un second signal de silence durant une seconde période de silence prédéterminée.

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