Addressing threats to on premises conferences for

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Addressing Threats to On-Premises Conferences for Lync Server 2010 Microsoft Lync Server 2010 provides the capability for enterprise users both inside and outside the firewall to create and join real-time Web conferences (meetings) that are hosted on internal Lync Server 2010 servers. Enterprise users can also invite external users who do not have an Active Directory Domain Services account to participate in these meetings. Users who are employed by federated partners with a secure and authenticated identity can also join meetings and, if promoted to do so, can act as presenters. Anonymous users cannot create or join a meeting as a presenter, but they can be promoted to presenter after they join. On-premises Web conferencing is built on top of the Lync Server 2010 basic security framework: All servers are trusted. All server connections and communications between collocated components are MTLS. All communications are encrypted. All users are authenticated. Enabling outside users to participate in on-premises meetings greatly increases the value of this feature, but it also entails some security risks. To address these risks, Lync Server provides the following additional safeguards: Participant roles determine conference control privileges. 38
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Microsoft Lync Server 2010 Security Guide Participant types allow you to limit access to specific meetings. Defined meeting types determine which types of participants can attend. Conference scheduling is restricted to users who have Active Directory credentials in the internal network and are enabled for Lync Server 2010. Anonymous, that is, unauthenticated, users who want to join a dial-in conference dial one of the conference access numbers and then they are prompted to enter the conference ID. Unauthenticated anonymous users are also prompted to record their name. The recorded name identifies unauthenticated users in the conference. Anonymous users are not admitted to the conference until at least one leader or authenticated user has joined, and they cannot be assigned a predefined role. Participant Roles Meeting participants fall into three groups, each with its own privileges and restrictions: Organizer. The user who creates a meeting, whether impromptu or by scheduling. An organizer must be an authenticated enterprise user and have control over all end-user aspects of a meeting. Presenter. A user who is authorized to present information at a meeting, using whatever media is supported. A meeting organizer is by definition also a presenter and determines who else can be a presenter. An organizer can make this determination when a meeting is scheduled or while the meeting is under way. Attendee. A user who has been invited to attend a meeting but who is not authorized to act as a presenter.
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