System and method for implementing local number portability

Details System and method for implementing local number portability System and method for implementing local number portability

1996-11-19

1998-03-24

Hong, Harry S.

Telephonic communications

Special services

Call diversion

379213, 379220, 379230, 379246, 379258, H04M 342, H04M 700, H04M 300

Patent

active

057321310

ABSTRACT:
A system and method for routing communications to a terminating station associated with a porting subscriber directory number when the porting subscriber line 14a is cut-over from a donor switch 12a to a donee switch 12b. Upon cut-over of the porting subscriber line 14a, a local number portability (LNP) activation telephone call is placed to a dial-in platform 50 that activates a previously provisioned but inactive LNP database entry for the porting subscriber directory number. The LNP database entry is located in an LNP database 42a at a service control point (SCP) 28a. The dial-in platform 50 also activates a previously provisioned but inactive directory-number-level trigger for the porting subscriber directory number at the donor switch 12a. Activating the directory-number-level trigger for the porting subscriber directory number at the donor switch 12a causes the donor switch 12a to hold a subsequently received telephone call directed to the porting subscriber directory number. The donor switch 12a then transmits a query message to the SCP 28a and holds the telephone call until it receives a response message including routing instructions from the SCP 28a. Activating the LNP database entry for the porting subscriber directory number in the LNP database 42a at the SCP 28a associates the porting subscriber directory number with the donee switch 12b. Activating the LNP database entry therefore allows the SCP 28 to determine the correct terminating switch for the held telephone call, which after cut-over, is the donee switch 12b.

REFERENCES:
patent: 4959856 (1990-09-01), Bischoff et al.
patent: 5544236 (1996-08-01), Andruska et al.
patent: 5577110 (1996-11-01), Aquino
patent: 5598464 (1997-01-01), Hess et al.

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