[Freeswitch-users] Access to sip_history_info from python

Hi, I'm a freeswitch newbie. I have written a python script that processes calls that are diverted to it. Its sort of a messaging system that triggers some other python processes that run outside of mod_python. I want to from within the mod_python executed python code have access to the SIP header field History-Info. I can use this to help in determining how the call ended up been processed by my python code. The sofia variable sip_history_info is what I need access to but I'm at a loss to figure out how I can get to it from python. If I could get the entire SIP header I can probably parse that to extract the History-Info. Your help would be appreciated. Regards, John