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:
Feb. 04, 2014
Filed:
Mar. 24, 2011
Bejoy Pankajakshan, Olathe, KS (US);
Warren B. Cope, Olathe, KS (US);
Pallavur Sankaranaraynan, Overland Park, KS (US);
Bejoy Pankajakshan, Olathe, KS (US);
Warren B. Cope, Olathe, KS (US);
Pallavur Sankaranaraynan, Overland Park, KS (US);
Sprint Communications Company L.P., Overland Park, KS (US);
Abstract
A call session control function (CSCF) controls a communication session between a first communication device and a second communication device. The first communication device detects a loss of signal and transmits a modified session initiation protocol (SIP) bye message. The modified SIP bye message includes a code that indicates a loss of the communication session and an identifier for the second communication device. The CSCF receives the modified SIP bye message and in response to the code, subscribes with a home subscriber server (HSS) for a registration notification for the second communication device. The second communication device subsequently transfers a SIP registration request and the CSCF responsively receives the registration notification for the second communication device from the HSS that indicates a network address for the second communication device. In response to the registration notification, the CSCF transfers SIP invite messages to the first and second communication devices to re-establish the communication session.