US008599838B2 (12) United States Patent (10) Patent No.: US 8,599,838 B2 Buckley (45) Date of Patent: Dec. 3, 2013 (54) SYSTEMAND METHOD FOR 2004/O137918 A1 7/2004 Varonen et al. EFFECTUATING ASIP CALL INA 2004/O184435 A1 9, 2004 Westman 2004/0203680 A1 10/2004 Sylvain NETWORKENVIRONMENT INCLUDING 2004/0235483 A1 1 1/2004 Sylvain MS 2005/0058.125 A1 3/2005 Mutikainen et al. .......... 370,354 2005/O130657 A1 6/2005 Creamer et al. (75) Inventor: Adrian Buckley, Tracy, CA (US) (Continued) (73) Assignee: BlackBerry Limited, Waterloo (CA) FOREIGN PATENT DOCUMENTS (*) Notice: Subject to any disclaimer, the term of this EP 1811 745 A1 7/2007 patent is extended or adjusted under 35 EP 2367335 9, 2011 U.S.C. 154(b) by 554 days. (Continued) (21) Appl. No.: 12/915,125 OTHER PUBLICATIONS (22) Filed: Oct. 29, 2010 CIPO, Office Action, Application No. 2,605,102, Nov. 21, 2012, 3 pg.S. (65) Prior Publication Data (Continued) US 2011 FOO44325 A1 Feb. 24, 2011 Primary Examiner — Simon Sing Related U.S. Application Data Assistant Examiner — Simon King (63) Continuation of application No. 1 1/347,874, filed on (74) Attorney, Agent, or Firm — The Danamraj Law Group, Feb. 6, 2006, now Pat. No. 7,830,868. P.C. (51) Int. Cl. (57) ABSTRACT H04L 2/66 (2006.01) In one embodiment, a scheme is disclosed for effectuating a (52) U.S. Cl. call in a network environment including a circuit-switched USPC ........ 370/353; 370/354; 370/356; 379/88.17; (CS) network and an IP multimedia subsystem (IMS) net 455/403:455/428 work. Call information associated with a call is sent from a (58) Field of Classification Search user equipment (UE) device to an application server (AS) USPC ........ 379/88.17; 370/353,354,356:455/403, node disposed in the IMS network. The call information 455/428 includes at least one of a call reference number and a called See application file for complete search history. party's URI. When a message is received at the UE device from the AS node, which message includes the call reference (56) References Cited number and an IP multimedia routing number (IMRN), the returned call reference number is verified that it remains valid U.S. PATENT DOCUMENTS based on a local timer mechanism associated with the UE 7,710,950 B2 5/2010 Buckley et al. device. The IMRN is then sent to the application server in 2002fO184302 A1* 12/2002 Prueitt et al. .................. TO9,203 order to facilitate a session with respect to the called party. 2004/0028052 A1 2/2004 Chen et al. 2004/0096042 A1 5, 2004 Orwicket al. 12 Claims, 6 Drawing Sheets 100 E. 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