[Freeswitch-users] Do Freeswitch conference support silent suppression?

Currently I'm trying to create conference server using Freeswitch and hook up with the ROIP device (Vocality). The ROIP device is act as the voip extension for the Freeswitch, In order for the radio link to work, the conference must support the VAD/CNG so that the silence is not transmitted by the ROIP device to its radios.My problem is the ROIP will always transmit something on the radio. Am I correct to conclude that the Freeswitch not supporting silent suppression while in the conference mode.? thank you -nordin mohamed