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Scenario

A SIP User Equipment (UE) is registered with an Application Server (AS).

Background Information

• The UE may belong to a public or a private network and AS belongs to a core network.
• The

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   is intermediary between the UE and the AS in the core network.
• The UE is pre configured with one or more

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  addresses.
• The

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  protects core network from harmful attacks and high traffic levels.
• The

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  authenticates and ensures only registered subscribers or UE's access the service.
• The

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  provides facilities for protocol repair and verification.
• The

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  routes the UE registration request to an appropriate AS.

Description

• When the UE contacts the

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  and the UE is unable to authenticate with the AS, the

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  rejects the

• UEs request for service.
• If the UE is able to authenticate with the AS, the

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  recognizes the UE and allocates the resources for that UE.