An interface circuit 104 provides audio and data communications between a telephonic switch 102 and an agent computer 106. The agent computer 106, telephonic switch 102 and interface circuit 104 are comprised by a communications system 100. The interface circuit 104 includes an integrated circuit 204 for receiving signals from, and transmitting signals to, the telephonic switch 102. A driver circuit 206 interconnects a data interface 200 in an agent terminal 112 to provide data communications from the integrated circuit 204 to the agent computer 106. An audio level control 208 provides audio communications between the integrated circuit 204 and the agent computer 106 and a headset.