Abstract: A system suitable for encoding typographic characters into two digit base ten values and to decode such values to typographic characters are disclosed. The system maps typographic characters, such as letters in the English language and puctuation symbols into two decimal digit numeric codes. The mapped numeric codes allow all upper and lower case English letters to be identified by a unique two digit code, that may be encoded using conventional DTMF tones. The system similarly decodes two digit numeric codes, so encoded. The system optionally include a DTMF generator and decoder. Methods used by the system are also disclosed.

Abstract: A method of exchanging voice mail messages between voice mail systems is disclosed. A voice mail system employing the method is also disclosed. The method comprises establishing a message exchange session between a first and second voice mail system. Information about features offered at each system is exchanged between the systems. Using this information the features that are common to both systems are determined. Thereafter, message data used only by features common to both systems is exchanged.