[Users] acc_radius question

Hi, When sends openser accounting packets for INVITE, and BYE message? it seems to be, when received 200 OK. 1)for INVITE i need radius packet immediately, not just when it was answered. 2)for BYE i need accounting packet, when any error occured too. modparam("acc", "radius_flag", 2) modparam("acc", "radius_missed_flag", 3) this attribute mean that, should sent radius packet, when any error occured too, isn't it? However openser don't send accounting packet in this case. i run into the following error: ########## T called -> openser BYE sip:21.16.8.92:5060 ## T openser->called SIP/2.0 477 Unfortunately error on sending to next hop occurred (477/TM) ########## T caller->openser BYE sip:66610038641368254@21.16.8.90:5060; ##### # openser -> caller SIP/2.0 481 Call Leg/Transaction Does Not Exist.. So no 200 OK for BYE received, therefore no accounting packet to radius sent. How can i solve these problems? Btw, what could cause this 477 error? Thanks, Tamas