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:
Jun. 30, 2009
Filed:
Sep. 15, 2004
Hyun-seo Park, Daejeon, KR;
Sook-yang Kang, Daejeon, KR;
Kyung-sook Kim, Daejeon, KR;
Young-jick Bahg, Daejeon, KR;
Hyun-Seo Park, Daejeon, KR;
Sook-Yang Kang, Daejeon, KR;
Kyung-Sook Kim, Daejeon, KR;
Young-Jick Bahg, Daejeon, KR;
Electronics & Telecommunications Research Institute, Daejeon, KR;
Abstract
The SIP-based multimedia communication system for providing mobility using lifelong numbers provides mobility through SIP network service domains and a global domain. The SIP network service domain comprises a user agent and an SIP network server. The user agent transmits request/response messages between users to set up, correct, and cancel calls, and when contact information of the user agent is registered and registration of the contact information is cancelled, requests to be informed of state changes in registration information. The SIP network server performs message routing between user agents and informs the contact information of the user agents during message routing. The global domain manages the SIP network service domains and allocates global SIP identifiers, that is, lifelong numbers to users to provide user-centered mobility.