[Freeswitch-users] propogating channel variables

There is a channel variable I am adding to calls as they arrive that I would like to see within raised events. Specifically, I am adding my own database index to the A-leg, passing the call to mod_callcenter, then capturing the CHANNEL_ANSWER event where I am looking for this same index value. Unfortunately, I am not able to persist this custom channel variable for the duration of the call, despite using ‘export’. Could you suggest how I may accomplish a channel variable’s persistence in this situation?