[Freeswitch-users] blind or attended transfer detection

Hi, Is there an easy way to detect if a channel is being or has just been transfered (blind or attended)? The objective would be to make loopback channels bowout on transfer (adding "loopback_bowout_on_transfer" variable), for mod_callcenter to "release" a loopback agent (mark it available for new calls) if it transfers the call to another destination. It might also be useful to have some type of "on_transfer" hook for other purposes (log transfer attempts, authorize/deny transfer, ...). Thanks, François.