[Freeswitch-users] Switch on/off call recording

Hi, I have setup a little call center application using mod_callcenter. Now what I want is to record all the calls based on the click of an ON?OFF button on the web app. Is there any variable or something like that which I can set like True or False to switch the call recording on or off? Also I want to know if the recording is possible per agent or not i.e. the call session to be recorded for a particular agent. Please throw some light on this. Thanks in advance. Regards -Ashish