Adds eight channels for internal IP telephony and internet telephony. Provides additional codecs with voice compression to ensure optimum sound quality with VoIP even for smaller bandwidths. Each COMmander 8/16VoIP-R module can be expanded to 16 VoIP channels. If you plug in the first COMmander VoIP-R module the included two VoIP channels will be disabled. Number of modules which can be used in the COMmander 6000R/RX: 4