[Freeswitch-users] 3 sessions instead of one. with use loopback.

Hi, I have ESL client that send comand to FS for invite person to conference like : "conference 777 dial loopback/ADD_CONF_1007" and dialplan for catch this : <condition field="destination_number" expression="^ADD_CONF_(\d{4})$" break="on-true"> <action application="set" data="hangup_after_bridge=true" /> <action application="bridge" data="user/$1" /> </condition> and I have three channels : loopback/ADD_CONF-a and loopback/ADD_CONF-b - (that`s created loopback?) and sofia/internal/sip... How can I close loopback channels, thats do not need as understand after bridge?