Call forwarding in an IP multimedia subsystem (IMS)

Details Call forwarding in an IP multimedia subsystem (IMS) Call forwarding in an IP multimedia subsystem (IMS)

2005-05-27

2011-11-15

Duong, Frank (Department: 2474)

Multiplex communications

Pathfinding or routing

Combined circuit switching and packet switching

Reexamination Certificate

active

08059633

ABSTRACT:
A method and Serving Call/State Control Function (S-CSCF) for handling a Session Initiation Protocol (SIP) communication within an IP Multimedia Subsystem (IMS), wherein the communication is subject to a call-forwarding operation handled by a SIP Application Server (AS). An INVITE is received at the S-CSCF, which serves a user equipment (UE) identified by an R-URI. The S-CSCF adds a URI for the S-CSCF to the INVITE route header together with an Original Dialog Identifier (ODI) mapped to the R-URI. The S-CSCF forwards the INVITE to the AS, which changes the R-URI to a URI of a UE to which the call is to be forwarded. The AS adds a forwarding indicator to the INVITE and returns it to the S-CSCF. The S-CSCF identifies the forwarding indicator and determines the original R-URI based on the ODI received in the returned INVITE. The S-CSCF determines call restrictions and Initial Filter Criteria (IFCs) based on the original R-URI.

REFERENCES:
patent: 7529839 (2009-05-01), Varga et al.
patent: WO 2004/086723 (2004-10-01), None
ETSI TS 124 229 V5.12.0, Internet Protocol (IP) multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP), Stage 3 (3GPP TS 24.229 version 5.12.0 Release 5), 263 pages, 2005.

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