The BP50 is optimised for telephone systems with up to 64 extensions and the larger BP250 caters for organisations needing up to 300 extensions.

The BP50 central system is a single compact wall cabinet with five board slots and the BP250 is comprised of between one and three wall mounted cabinets, each with nine board slots.

Both systems have a built in switched mode power supply, with the option of an external battery back up unit or alternative DC power supply.