| 摘要 |
A method and means by which a called telecommunications device (14), connected on an established PSTN telecommunications link (18) with a wireline data processing means caller telecommunications device (12), can initiate a conference call to be set up from the wireline caller device (12) by sending a command signal to the data processing means caller device (12). In response to the command signal, the data processing means caller device (12) executes a signal set, predetermined to cause the PSTN (18) to set up the desired conference link (20) at the caller end of the established link (18). The method can be applied by a called alarm monitoring facility (14) to obtain emergency assistance for a distressed wireline caller (12) by causing a conference link (20) with a caller local PSAP (16) to be set up automatically from the wireline caller device (12). In so doing, the method promotes the acquisition of needed emergency assistance in the least attainable time while accessing the best source of relevant emergency information.
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