[Freeswitch-users] Can't mute SIP channel with "receiveonly" in SDP

Hy all! With Asterisk I can mute SIP channel using re-INVITE with "a=receiveonly" in media description. But this feature doesn't work with Freeswitch. For sure, there is old good method: transfer both legs to the conference room where one leg is able to listen/talk, the other one - only to listen, but this is unwanted workaround for me.. So I wonder: is there any other (preferably through the SIP) way to "mute" given SIP channel with Freeswitch? Thanks for all, Artem Shiyanov