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.
