| 摘要 |
An emergency call location tracing system comprising a wireless PBX composed of a number of base stations, each having a specific range and area of coverage. When emergency services (911) are dialed from any mobile telephone, the PBX intercepts the 911 call, and dynamically provides special treatment for this type of call before transmitting it. The PBX operates to identify the base station through which the call was transferred, and provides the caller extension number or DID number, and the base station being used, so that a phone number and location identifier are encoded within the coded information for the call being transmitted. The standard transmission protocol has subaddress fields for use in encoding this information so that it can be included within the transmitted phone call. When received by the emergency services provider, the coded information can be obtained by appropriate decoding techniques, and a translation table may be used to identify the physical location of the base station initiating the call. Thus, a mobile telephone which initiates an emergency call benefits from the inventive system since its physical location and extension number are coded with the telephone call itself, for use by the emergency service provider in quickly and more efficiently dispatching emergency services to the correct location <IMAGE> |
