US Patent 8184590 Method and system for handoff between wireless networks

Patent 8184590 was granted and assigned to Counterpath on May, 2012 by the United States Patent and Trademark Office.

Overview Structured Data Issues Contributors Activity

Is a

Patent

Patent attributes

Current Assignee

Counterpath

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

8184590

Date of Patent

May 22, 2012

Patent Application Number

11832928

Date Filed

August 2, 2007

Patent Primary Examiner

Chi Pham

Patent abstract

A method and system for operating a standalone client in a dual-mode mobile communications device to hand off a call between first and second wireless networks operating under different communications protocols, using Session Initiation Protocol (SIP) and ISDN User Part (ISUP) signalling. The standalone client-side application, or handoff agent, directly controls handoff of the call to the second wireless network until at least one new media stream to connect the dual-mode mobile communications device to the second device is established over the second wireless network. The standalone client-side application solely originates and controls an exchange of messages at the application layer, the exchange of messages modifying the communications channel.