| 摘要 |
Emergency services calls may be alternate-routed in an intelligent network having at least one Service Control Point (SP) with access to a routing table, a plurality of Service Switching Points (SSP) equipped with point-in-call triggers and one or more emergency services stations (PSAP) The routing table lists a routing number for each of the emergency services stations. The method comprising the steps of: (i) at a Service Switching Point, presetting a point-in-call trigger to operate at a predetermined point in a call for emergency services, (ii) subsequently, during processing of an emergency services call, interrupting processing of the call and transmitting to the SCP a query signalling message requesting routing information, (iii) at the SCP, accessing the routing table in dependence upon parameters in the query signalling message and obtaining a routing number for a selected emergency services operator station, forming a response signalling message including the routing number and returning such response signalling message to the SSP, (iv) at the SSP, detecting the routing number, and routing the call to the emergency services operator station. There is also provided a method of translating signalling message parameters from a mobile protocol to an intelligent network protocol, and vice versa, to enable emergency services calls from mobile users to be routed to one or more PSAPs in the network.
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