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This is the dashboard for those with administrative privileges (so, this won't be displayed to ordinary users) to add domains, user accounts and to assign user licenses to SharePoint and Lync.
This console allows you to set certain settings for Lync users. From here, you can set whether Lync users can communicate with the 'outside world' from your corporate network, and link in landline phones and suchlike with your communications platform.
The dial-in conferencing page allows the administrator to select certain users to use conferencing calls using pre-defined settings from the landline provider.