[Freeswitch-dev] Doubt Regarding Interrupt a conference

Hi, I have the following query. Let us assume that there are n users connected from sip phone and m users who are connected from PSTN on the same conference. If suppose say, one among the n or m users who are connected via SIP phone or PSTN has a doubt/want to interrupt a conference, is there any option like 'raise hand'. What I mean is, do we have any option of dialing say some digit in the phone (PSTN) (when the conference is going on) which in turn will notify other users that this user wants to raise hand. -- Regards, Mahesh R