08184590 is referenced by 136 patents and cites 12 patents.

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.

Title
Method and system for handoff between wireless networks
Application Number
11/832928
Publication Number
8184590 (B2)
Application Date
August 2, 2007
Publication Date
May 22, 2012
Inventor
Ariel Rosenblatt
Pincourt
CA
Agent
Borden Ladner Gervais
Anne Kinsman
Assignee
CounterPath Technologies
CA
IPC
H04J 3/22
H04J 3/16
H04J 3/00
H04W 4/00
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