Department of Computer Science and Electrical Engineering
In addition to call recording, the device also features sophisticated call management functionality. This allows it to answer and initiate phone calls, identify the remote party via calling number display (CND) or dialed DTMF signals, and communicate with other devices on the phone network via DTMF. The business phone conversations archived by this device include relevant call signaling information in addition to the voice recording.
This device is implemented using an audio codec, connected via the ISA bus to an IBM PC, which is the host computer. Recorded calls and the associated data can be stored using the common methods of digital data storage, typically the hard drive of the host computer for short term, and computer backup tape for long term storage.
A fundamental feature of this product is that it can be programmed to provide a variety of services involving phone calls. Possible uses range from a simple answering machine or interactive voice response service, to intelligent call diversion and voice-over-IP connectivity.
This thesis describes the voice signal handling side of the product. The call signal (DTMF, CND etc) functionality is the topic of the thesis by Mathew Sullivan.
A prototype has been developed, and has been used successfully to record simulated phone calls. The complete design as intended is yet to be realized. However, there is some evidence that the core capabilities of the system are viable with the planned design.
Complete thesis:
thesis.pdf
Additional material:
conference_paper.pdf