Routing calls destined for inaccessible destinations

H - Electricity – 04 – M

Patent

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Details

H04M 3/54 (2006.01)

Patent

CA 2115602

An arrangement for selectively routing traffic to alternate destinations. If the network or switch for accessing the primary destination is inaccessible (i.e., out of service), as opposed to simply being busy, calls are routed to an alternate destination; however, if the primary destination is simply busy, calls are not routed to any alternate destination. This is useful, for example, for emergency (E911) calls which are routed to alternate emergency bureaus only if the network or switch for accessing the home bureau is out of service. Alternatively, the tandem switch can select an alternate toll carrier on the basis of allocation of traffic to different alternate toll carriers. The same general kind of arrangement can be used to route calls to an alternate toll carrier if the preferred toll carrier selected by the customer is not accessible.

L'invention est un dispositif d'acheminement sélectif du trafic à des destinations de rechange. Quand le réseau ou le commutateur d'accès à la destination primaire est inaccessible (c'est-à-dire hors service) et non pas simplement occupé, les appels sont acheminés à une destination de rechange; toutefois, quand la destination primaire est simplement occupée, les appels ne sont pas acheminés à une destination de rechange. Ceci est utile, par exemple, pour les appels d'urgence (numéro 911) qui ne sont acheminés à des bureaux de rechange que si le réseau ou le commutateur d'accès au bureau principal est hors service. Le commutateur tandem peut également choisir un central interurbain de rechange en se basant sur le protocole d'affectation du trafic à des centraux interurbains différents. Ce genre de dispositif peut être utilisé pour acheminer les appels à des centraux interurbains de rechange quand le central interurbain privilégié par le client n'est pas accessible.

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