Accessing IP multimedia subsystem

Details Accessing IP multimedia subsystem Accessing IP multimedia subsystem

2007-12-04

2007-12-04

Nguyen, Lee (Department: 2618)

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

C370S356000, C455S432100, C455S435100

Reexamination Certificate

active

10479457

ABSTRACT:
A method and a system for providing access to an IP multimedia subsystem (IMS) for a subscriber roaming in a visited communication network are described. A subscriber equipment determines that a visited network IMS is not accessible and sends a register message for registering to an IMS to a control entity in the home communication network of the subscriber. The control entity recognizes that the register message is received directly from a subscriber equipment, and an access entity for accessing the IMS of the home network is assigned. Then, the control entity sends a message to the subscriber equipment which message comprises the address of the access entity.

REFERENCES:
Napolitano-Ricagni, “UMTS AII-IP Mobility Management Call Session Control Procedures”, Internet Draft, Mar. 24, 2000, XP002149519, pp. 1-24.
Cookson et al, “3G Service Control”, BT Technology Journal, vol. 19, No. 1, Jan. 2001, pp. 67-79, XP001006581.
“3rdGeneration Partnership Project; Technical Specification Group Services and System Aspects; Architecture Principles for Release 2000 (Release 2000)”, 3G TR 23.821 VI.0.1, Jul. 2000, pp. 1-62, XP002175634.

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