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:
Jul. 31, 2001
Filed:
Sep. 11, 1998
Samuel Henry Christie, IV, Cary, NC (US);
Patrick J. Dagert, Raleigh, NC (US);
Nortel Networks Limited, Montreal, CA;
Abstract
Method and apparatus for transferring a call leg in a telecommunication network and releasing it to free up resources, while allowing retrieval at a later time under specified conditions. Message extensions are provided for interfaces used between service nodes and host switches in a telecommunication networks. The invention is appropriate for use in an integrated services digital network (ISDN), in an internet protocol (IP) telephony network, or in any other type of telecommunication network. The service node sends a transfer request and retrieval conditions -to the switch. The switch stores the conditions and transfers the channel with the appropriate call leg, but can retrieve the call leg when one of the conditions is met.