Method of optimizing calls set up in a private...

Details Method of optimizing calls set up in a private... Method of optimizing calls set up in a private...

2003-08-13

2008-10-14

Caldwell, Andrew (Department: 2141)

Electrical computers and digital processing systems: multicomput

Computer-to-computer session/connection establishing

Reexamination Certificate

active

07437465

ABSTRACT:
A method is disclosed of optimizing calls set up in a private telecommunication network including two subnetworks using the QSIG protocol and the Session Initialization Protocol, respectively, when a first terminal belonging to the subnetwork using the SIP requests the setting up of a call with a server associated with a first switch belonging to the subnetwork using the QSIG protocol and the call must be transferred to a second terminal belonging to the subnetwork using the SIP. The two subnetworks are connected by a QSIG/SIP gateway associated with a second switch of the subnetwork using the QSIG protocol. The method conventionally sets up a first call between the first terminal and the first switch and a second call between the first switch and the second terminal and then joins the two calls in the first switch so that the first and second terminals communicate via the gateway, the first switch, and the second switch. Conventional functions of the QSIG protocol and the SIP are then used to set up a third call between the first terminal and the second terminal exclusively within the subnetwork using the SIP and then to clear down the first call and the second call.

REFERENCES:
patent: 6795430 (2004-09-01), Ong et al.
patent: 0876041 (1998-11-01), None
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patent: WO 02/23768 (2002-03-01), None
Elwell et al., Interworking between SIP and QSIG, IETF, Jun. 2002, pp. 1-40.
Sipping, Challenges when interworking QSIG and SIP CallTransfer (3 printouts of thread conversation), IETF, Dec. 2002.
J. Elwell, “Interworking between SIP and QSIG”, IETF Draft, ‘en ligne!’ Aug. 7, 2002, pp. 1-45, XP002240568.

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