S.I.T.T.I has both designed and manufactured this new VCSS. It is a fully digital system with CCITT A-law voice encoding pulse code modulation. M600 allows the connection to both analogue and digital lines, its design based on a dual-system philosophy with distributed microcomputer processing. The Intercom function is a built in facility.

All positions are equipped with colour or monochromatic touch-screen devices, which in conjunction with the Reconfiguration and Monitor Unit, provide the system with the highest degree of flexibility. The positions can be connected by fibre optic to ensure a "secure" application.

The telephone and radio interface cards accommodate all types of telephone communication systems and permit the management of all radio equipment. The system provides the operators with a complete and efficient management of the individual radio equipment (parameters configuration, frequency tuning, channeling selection, etc...). Due to its intrinsic organization, the system characteristics guarantee a constant "full duplex" audio management. Nevertheless, to comply with the end-user operational requirements, it a common procedure to provide different functionality toward the radio equipment themselves ("full duplex", "half duplex", "simplex"), to permit their use for different applications (G/A, G/G communications, different frequencies tuned between reception and transmission, etc...).