[SR-Users] call_id in dialog module

[‪mahsa _a_‬ ‪]

hi all;i want to write "billing" project with  kamailio,i using python,postgresql, dialog module and falcon.my problem is in "call_id" section.my code(this section) is in python :
"""...
if (method   ==  'INVITE'):
            callid          =        req.get_param_as_list("call_id")
            print(req.get_param_as_list("Ts")) 
            print("call id = %s " % callid)
elif (method   ==  'ACK'):            
            time_req    =       int(req.get_param_as_list("Ts")[0])
            callid      =        req.get_param_as_list("call_id")[0]
            print("user %s call to %s at time %d %            (from_user,to_user,time_req))...          
"""
and in kamailio.cfg:
"""http_query("http://127.0.0.1:5000/test?method=$rm&            call_id=$dlg(callid)&Ts=$Ts&fu=$fu&tu=$tu","$var(result)");
""""
"callid" in ACK is ok but "callid' in invite is "null", where is my problem?
thanks.

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