| 摘要 |
The invention relates to establishing trust between parties (32, 30, 38) pri or to a multiparty communications session over the Internet or the like. This i s achieved by the exchange of messages describing user roles required to be performed during a session, and the assumption of the described roles by the parties (30, 32, 38) to a session. The assumption of a role is non-repudiabl e via the use of digital signatures, in that a party (32, 30, 38) must digital ly sign the message or part thereof which indicates that it intends to assume a role. The roles relate to control functions to be performed during the session, such as Quality of Service determiner (30), or Quality of service signaller (38).
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