| 摘要 |
Methods for enabling a non-DID station of a PBX or MLTS to receive a PSAP call back include assigning a special DID number for use by non-DID stations behind the PBX/MLTS, detecting when a non-DID station dials an emergency number, storing the station number of the non-DID station which dialed the emergency number, setting an emergency flag and a countdown timer, forwarding the special DID to the PSAP, detecting a call to the DID, routing the call to the DID to the stored station number so long as the timer has not expired, and dropping the emergency flag when the timer expires. An apparatus according to the invention includes a PBX switch coupled to a number of local stations, at least some of which are non-DID stations. The PBX preferably includes a processor, software, and storage registers. The PBX software is modified to carry out the methods described above.
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