Not only did Microsoft introduce enhanced video functionality in Lync Server 2013, but in Lync Server 2013 administrators are able to have greater control over Lync video functionality through in-band provisioning.
In Lync 2010 video bandwidth could be controlled through two key policies: the conferencing policy assigned to users, and the media configuration. In addition to these policies, Call Admission Control (CAC) could be used to control video bandwidth across sites.
In Lync 2013 the conferencing policy and CAC configurations remain, but the media configuration policy is no longer used by Lync 2013 servers and users.
Lync 2010 clients will still use the media configuration value