[Freeswitch-users] CHANNEL_HANGUP vs CHANNEL_HANGUP_COMPLETE

hello im wondering what should we track as hangup event ... CHANNEL_HANGUP or CHANNEL_HANGUP_COMPLETE ... i have a situation where A calls FS, an ESL application answers this call, originates a new call to B and bridges A and B... than ESL originate another call towards C and joins all 3 channels into a conference. now , A hangs up, FS sends just CHANNEL_HANGUP event ... not CHANNEL_HANGUP_COMPLETE ... im wondering if it is supposed to be like that or we need to get CHANNEL_HANGUP_COMPLETE ? T.