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:
Sep. 03, 1996
Filed:
Aug. 16, 1994
Horst Flake, Oberhaching, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
When information is to be exchanged in encrypted or unencrypted form on a per call basis between ISDN terminal equipment (15, 16; 20, 21), that is, data terminals, terminals or telecommunications systems, under the condition that the ISDN basic call procedures are available at the interfaces but supplementary services are not yet available everywhere, then, following a phase produced during the course of the call setup wherein the network (14) has already setup a connection between the calling and the called cryptographic equipment, the cryptographic equipment instead of the network control the further course of the call setup. The B-channel connection that already exists is employed for the mutual control, that is, the D-channel procedures at the ISDN terminal equipment interfaces are imaged onto B-channel procedures at the network interfaces upon employment of an expedient in-band coordination. The method can be employed in conjunction with the utilization of cryptographic equipment in ISDN.