The Fortissimo Cable Telephony Multiplexer is a stand-alone Fortissimo unit that works in conjunction with the Fortissimo IP Call Generator. Developers can simulate uniquely configured SIP traffic through cable modems and provide unique Ethernet MAC addresses and VLAN support. The unit gives the user flexibility to serve a wide range of applications associated with switch and network testing. The Fortissimo allows the user to test highly complex call scenarios and interactive applications under high call loads on hundreds of lines simultaneously in a dedicated lab environment.