Call Control Client is a general term. It speaks for a suite of software applications that are available with Masergy.
This list includes:
You can also use other third party applications like SalesForce.com, ACT!, and other integrated CRM services. These programs enable a user to use a web-based tool for service invocation and call control. Call Control Clients provide an alternative to using the handset of the phone. Call Control Clients are not a phone but provide simply a call control device. You can dial numbers, use Outlook contacts, View call history lists and other telephony functions including transferring calls and some allow you to change Masergy preferences.