The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 23, 2002
Filed:
May. 05, 1998
Applicant:
Inventors:
Assignee:
British Telecommunications public limited company, London, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04M 3/00 ; H04M 5/00 ;
U.S. Cl.
CPC ...
H04M 3/00 ; H04M 5/00 ;
Abstract
To provide secure communications to a PBX ( ) the PBX is connected to two different local exchanges of the PSTN. On recognising a telephone number designating calls to the PBX service switching points ( ) apply to service control points ( ) for route translations. The SCP ( ) directs calls though the network alternately to network connections on one DLE (say ) and then to the other DLE ( ). In the event of a predetermined number of call failure on one of the route all subsequent calls are directed to the other route until a predetermined number of call failures occur on the other route where upon consecutive calls are again offered alternately.