Remote Call Control

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Remote call control was the original form of PBX integration introduced with Live Communications Server 2005 and allows for users to control their legacy desk phone from Lync by clicking a contact in their contact list to dial. It also allows for their presence to be automatically updated to “In a call” when using the legacy phone.


Note

Support for new Remote Call Control implementations was originally going to be dropped in Lync Server, but the product team has adjusted its stance and will support new deployments. That said, it is a legacy technology and unlikely to be supported in future releases.


Remote call control does not give users the Enterprise Voice features for controlling calls, assigning delegates, or configuring call-forwarding settings. It also does not work remotely, so it can be used only inside the network, which limits its usefulness for remote workers.

Computer Supported Telecommunications Applications Gateway

A Computer Supported Telecommunications Applications (CSTA) Gateway was required to translate between older versions Communications Server and the PBX presence information. This gateway software usually involved an additional server component from the PBX vendor and additional user licensing. Lync Server instead uses the Get and Put verbs over SIP to control presence that can help to remove the dependency on the CSTA gateway, but a CSTA gateway might still be required depending on the PBX vendor. How the PBX and CSTA gateway integrate with Lync Server is shown in Figure 17.9.

Figure 17.9 CSTA Gateway

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