Lync 2013 has improved the voice experience. Learn about Voice in the cloud, including IP phone support and Hybrid voice providing on-premises interoperability with Lync Online. Learn about network stack changes including support for Internet Protocol version 6 (IPv6) for both mixed (v4/v6) & standalone environments. Understand how to implement robust session management with trunk to trunk routing, call routing with multiple gateways and IP-PBXs. Discover user functionality changes including delegation enhancements including Shared Line Appearance (w/IP phone) and simultaneous ring delegate calls and more administrative control of calling with per-call authorisation for forwarding & simultaneous-ring.