Abstract: The telebudgeter, a multi task telephone system, described herein contains an embedded dynamic least cost routing algorithm and an advanced updating mechanism. This multi task system represents a robust hardware and software design. The hardware design consist of a single chip microcontroller capable of implementing various basic and advanced telephony features while driving a number of peripherals such as LCD displays and transceivers. This multi task telephone system further includes an advanced algorithm to optimize long distance calls using linear digital filters. The system further comprises of a method to automatically purchase pre-paid services from a remote server using advanced encryption algorithms and update look up tables from a remote server over the public telephone network to which the system is connected. The system further includes a budgeting and auditing function that can be accessed locally or on the server via a secured website.