| Abstract
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As emerging real-time services on the Internet, such as Voice over IP
(VoIP), increase their visibility, a security framework has to be
provided. In particular, confidentiality is a main concern in the
multimedia scenario.
To support full flexibility of the services, a solution with IP all
the way (to the terminal) is believed to offer advantages, if
technically and economically feasible. Therefore, new requirements
have to be met on cellular access networks, and this has an impact on
the security solutions.
This document investigates requirements that a security scheme for
such applications should fulfill when used in a cellular environment.
The focus is mainly on the confidentiality of the media session, in
particular within the conversational multimedia scenario, which
proves to be the most demanding one.
The highlighted keypoints are the necessity of a trade-off between
security and cost to end up with an attractive service, and the
support of profiles.
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