| 摘要 |
The present invention relates to arrangements adapted for implementation in a Session Initiated Protocol, SIP, provider domain in IP multimedia Subsystem, IMS, for managing SIP user identities wherein each SIP user is identified by a SIP URI. In one aspect of the present invention the arrangement comprises a database adapted to store and publish at least one identifier selected by th e user, a content manager, adapted to associate the at least one selected identifier with the SIP URI of the user, and a search engine, adapted to search for a SIP URI in the database via the associated published selected identifier and to act as an interface between different SIP provider domains .
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