[Freeswitch-users] Tracking codec g729 by event

Hi, I'm trying to keep tracking on the use of codec g729 licenses on my server. I've a little ESL program that check all the events for a new call and if the call uses g729 i execute the api "g729_used" to fetch the value. This doesn't work, i try it on event CODEC, and EXECUTE. Is there any event that i can use that is trigger by the encoder/decoder in mod_com_g729 when it actives a license? Thanks, _________________________ António Silva