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.