| 摘要 |
<p>The present invention provides an inter-domain authentication mechanism carrying out a cross-domain authentication for a given user between an access network domain and a Multimedia domain, this inter-domain authentication mechanism being simpler than the currently existing one, and applicable where a user has been authenticates by access network.</p><p><Paragraphs id="pa02" num="0002" xmlns:base="http://www.sipo.gov.cn/XMLSchema/base">Therefore, there is a new feature provided in accordance with the invention, namely an "Implicit Authentication for Multimedia domain", which may be implemented as a dedicate Multimedia Authentication device in close co-operation with a subscriber server, or be fully integrated in said subscriber server.</p><p><Paragraphs id="pa03" num="0003" xmlns:base="http://www.sipo.gov.cn/XMLSchema/base">To this end, there is provided a new device, a new user's equipment, and a new method, all arranged for re-using authentication data between different networks, or between different technological domains, and with help from other entities of a Multimedia domain according to present standards.
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