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:
Dec. 11, 2012
Filed:
Dec. 05, 2011
Mihal Lazaridis, Waterloo, CA;
Thomas Charles Nagy, Waterloo, CA;
Vytautas Robertas Kezys, Hamilton, CA;
Ingo W. Weigele, Waterloo, CA;
Mihal Lazaridis, Waterloo, CA;
Thomas Charles Nagy, Waterloo, CA;
Vytautas Robertas Kezys, Hamilton, CA;
Ingo W. Weigele, Waterloo, CA;
Research In Motion Limited, Waterloo, Ontario, CA;
Abstract
A mobile device operates in a WLAN for VoIP communications, which includes registering with registrar server functionality of a SIP proxy server with a SIP identity which is further communicated to a location server. In response to an incoming voice call from a caller via a telephone network, the mobile device receives an INVITE request which is issued from a gateway and forwarded from the SIP proxy server. The mobile device sends a response to the SIP proxy server which is communicated to the caller via the gateway. When switching from the WLAN to the cellular network, the mobile device sends via the WLAN to the location server a message for forwarding voice calls directed to the SIP identity to the telephone number. The mobile device also sends via the cellular network a message for canceling the forwarding of voice calls directed to telephone number to the SIP identity.