The Fusion Voice Fault Tolerant Module is available in 3 different configurations. They are all priced the same - but how you order them determines the configuration of the HASPs that are shipped to you. There is no charge for changing the configuration of an existing FTM system to any other - however a request will need to be made to Dolbey - after which a new HASP configuration will be sent electronically for updating the systems. Consult the Fusion Voice Technical Support for configuration assistance.