DVMS is a Digital Voice Management System. The voice recognition provides access to the highest audio quality, and is mostly used in military communications such as US Air Force, and the United States Army. When the voices go through an encoder, it goes through other processes such as Bluetooth technology, and wireless headsets. The DVMS is also encrypted for use in two-way radio communication products, and cellphone use. IBM developed a channel with multiple voice ports that later support Satellite Communications. A newer version of this encoder or voice management system was revised in 1977. The functionality of the VAC and Delta Modulation has six control ports. The system uses a single integrated twelve-bit arithmetic circuit chip, and sample feeding modulators with six voltage ports, all for us with transformers, analog systems, and telephone line interfaces. Although, much trial and error were part of the process before perfection was finally achieved.