Method and apparatus for telephone routing between PTN and PSTN

Details Method and apparatus for telephone routing between PTN and PSTN Method and apparatus for telephone routing between PTN and PSTN

2006-01-23

2009-12-01

Smith, Creighton (Department: 2614)

Telephonic communications

Call or terminal access alarm or control

At switching center

C379S207150, C379S234000

Reexamination Certificate

active

07627101

ABSTRACT:
Disclosed is a method and apparatus applicable to an interface between PSTN and PTN for telephone routing. The interface includes a branch switch, a key system, a network branch switch, and media gateway, etc. The telephone routing method and apparatus of the present invention creates, maintains, and utilizes a call-back routing table to enable a specified PSTN user to call the callback external leased line to reach a specified PTN user in a one-stage dialing manner. The process of one-stage dialing includes PTN call origination to PSTN, PSTN call origination to PTN, and callback tag insertion in the call-back routing table. The call-back routing table consists of a plurality of call-back tags. Each call-back tag consists of at least a data triple, i.e. PTN user identifier, PSTN called party telephone number, and callback leased line identifier.

REFERENCES:
patent: 7162018 (2007-01-01), Toyoshima et al.
patent: 7272386 (2007-09-01), Meer
patent: 7369530 (2008-05-01), Keagy
patent: 2003/0039238 (2003-02-01), Ollis et al.
patent: 2003/0148757 (2003-08-01), Meer
patent: 2003/0194060 (2003-10-01), Stumer et al.

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