| 摘要 |
When a switch in a wireless network receives an emergency call from a mobile station lacking a unique identifier (a non-coded mobile station) assigned by a service provider, the switch stores the mobile equipment identity (MEID) of the mobile station in association with the default, non-unique identifier of the mobile station in a mapping table. The switch routes the emergency call to a Public Service Answering Point (PSAP) and sends an emergency routing number assigned to the switch as the calling party number. The switch also signals the MEID of the mobile station to the PSAP. If the emergency call drops, the PSAP performs a call back to the emergency routing number and supplies the MEID of the mobile station associated with the call back. The switch, upon receiving a call back using its emergency routing number, accesses the default mobile station identifier from the mapping table using the MEID, and pages the mobile station using the default mobile station identifier. The switch will complete the call back to a mobile station responding to the page if the mobile station has an MEID that matches the MEID of the call back. Besides non-coded mobile stations, the methodology is also applicable to coded mobile stations.
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