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:
Mar. 17, 2015
Filed:
Oct. 19, 2009
Priscilla Lau, Fremont, CA (US);
Loc BA Vo, Pleasant Hill, CA (US);
Priscilla Lau, Fremont, CA (US);
Loc Ba Vo, Pleasant Hill, CA (US);
Verizon Patent and Licensing Inc., Basking Ridge, NJ (US);
Abstract
A device monitors a session description protocol (SDP) parameter associated with a voice over Internet protocol (VoIP) call provided via a network and a user equipment, and determines, based on the SDP parameter, whether the VoIP call changed from an active state to a hold state or from a hold state to an active state. The device also sends, after the VoIP call is determined to change from an active state to a hold state, a session initiation protocol (SIP) keep alive message to the user equipment to prevent the user equipment from entering a dormant state and to prevent a radio link connection between the user equipment and the network from being released.