Remote Call Control was the original form of Lync Server PBX integration introduced with Live Communications Server 2005. It enables users to control their legacy desk phone from Lync. Users can click to dial a contact in their buddy list, which actually instructs the desk phone to place the call. It also allows for their presence to be automatically updated to “In a call” when they are using the legacy phone. In this case the media stream and codec negotiation is not handled by Lync Server at all. Instead, Figure 17.9 displays how the traditional desk phone and integrated PBX handles the call.