Accessing IP multimedia subsystem
First Claim
1. A method of providing access to an IP multimedia subsystem (IMS) for a subscriber roaming in a visited communication network, said method comprising:
- determining in a subscriber equipment that a visited network IMS is not accessible;
sending a register message for registering to an IMS from the subscriber equipment to a control entity in a home communication network of the subscriber;
recognizing at the control entity that the register message is received directly from the subscriber equipment;
assigning an access entity for accessing the IMS of the home network;
sending a message from the control entity to the subscriber equipment which message comprises the address of the access entity.
8 Assignments
0 Petitions
Accused Products
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.
45 Citations
29 Claims
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1. A method of providing access to an IP multimedia subsystem (IMS) for a subscriber roaming in a visited communication network, said method comprising:
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determining in a subscriber equipment that a visited network IMS is not accessible; sending a register message for registering to an IMS from the subscriber equipment to a control entity in a home communication network of the subscriber; recognizing at the control entity that the register message is received directly from the subscriber equipment; assigning an access entity for accessing the IMS of the home network; sending a message from the control entity to the subscriber equipment which message comprises the address of the access entity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for providing access to an IP multimedia subsystem (IMS) for a subscriber roaming in a visited communication network, said system comprising:
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a subscriber equipment configured to determine that a visited network IMS is not accessible and configured to send a register message for registering to an IMS to a control entity in a home communication network of the subscriber, said control entity being arranged to receive the register message from said subscriber equipment, recognize that the register message is received directly from said subscriber equipment and send a message to said subscriber equipment which message comprises the address of an access entity for accessing the IMS of the home network. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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- 19. A subscriber equipment in a system for providing access to an IP multimedia subsystem (IMS) for a subscriber roaming in a visited communication network, said subscriber equipment being arranged to determine that a visited network IMS is not accessible, send a register message for registering to an IMS to a control entity in a home communication network of the subscriber and receive a message from said control entity which message comprises the address of an access entity for accessing the IMS of the home network.
- 23. A control entity in a system for providing access to an IP multimedia subsystem (IMS) for a subscriber roaming in a visited communication network, said control entity being arranged to receive a register message for registering to an IMS from a subscriber equipment, recognize that the register message is received directly from said subscriber equipment and send a message to said subscriber equipment which message comprises the address of an access entity for accessing the IMS of the home network of the subscriber.
Specification