Call Waiting Case Study

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Client Case Study - Call waiting indication

A client who had contracted Telefax to replace their existing trading floor displays with Trans-Lux DataWalls had a visual call waiting indicator on the existing displays that they wished to retain with the new displays. Due to the noise levels on the floor an audible indication (like normal ringing or warbling tones) was undesirable. Instead a number would flash on the displays, each broker having their own unique number. Their telephone system provided an indication that a call was waiting to be answered by switching a relay that energized a signal wire at a steady low voltage (24V DC).

Telefax sourced a suitable PC card which could interface to these signals. Telefax then developed an application to interface to their standard DataWall administration software application that enabled the display and flashing of a user defined string on the display. Initially this was configured to replicate the numeric display of the old system but could in future be used to flash the brokers name or any other user defined identifier on the displays. The Telefax IMS DataWall Administration software also allows the call waiting indicators to be placed anywhere on the new displays, so the client is not restricted to the existing format of display but free to reconfigure it at will.

This client also required the information on the displays to be entered by their own staff in a fixed format. They developed a Visual Basic application which provided a form style input screen for their staff and used the same Telefax API to transfer this information to the Telefax IMS DataWall Administration application for display on the LED DataWalls. Their developers were able to demonstrate a proof of concept system working at our Whitstable offices within a few days of requesting the API details from Telefax.