The feature phone application is a fully functional telephone based on the DSP5685x family that provides a highly flexible framework for screenphone and telco service products. This flexibility permits device manufacturers to quickly add a custom user interface and value-added convenience features, such as number and call log directories, voice announce for caller ID, and digital answering/paging functions. The feature phone application can be expanded to support multi-line applications with multi-line conferencing. Feature phone compatibility with telephone networks is worldwide for call origination, call termination and speakerphone operation. Feature phone CLASS features are compatible with GR-30-CORE compliant networks (North America). Figure 1 illustrates the system diagram of the feature phone. The feature phone application's customizable framework uses four telephony DSP modules. The application software contains the main control loop and a real-time kernel that manages the telephone state and makes calls to dedicated PE modules to perform various functions. The application software performs all start-up initialization and buffer allocation for the telephony modules and hardware drivers and implements communications between device and peripheral drivers and the telephony modules.