Patent ID: 7966656
Filing Date: 2011-06-21
Classification: H04L

Abstract:
1. A method of coupling a switched circuit network and an internet protocol network, said switched circuit network and said internet protocol network being interconnected by a gateway, said gateway comprising a database, said switched circuit network comprising a service, said service being identified by a service identifier, said internet protocol network comprising a group of application servers, said group of application servers comprising at least one application server, each of the at least one application server being identified by a specific application server identifier, said method comprising: generating an entry in said database in response to a service call requesting said service if said service call is routed to an available application server, said service call being received from a calling party, said calling party being located on said switched circuit network, said entry comprising said service identifier and said specific application server identifier of said available application server; deleting said entry after a given period of time; sending a control message to said calling party in response to said service call if said service call is routed to an unavailable application server and if only the specific application server identifier of said unavailable application server is comprised in said database or if said service call is routed to an unavailable application server and if all application servers of said group of application servers are unavailable and if the specific application server identifiers of all application servers of said group of application servers are comprised in said database.