[SR-Users] Kamailio IMS_QOS

Hello There, I'm trying using the ims_qos module with PCRF for QOS, but I'm facing some issues. When kamailio receives an initial invite (originator), it will execute the function - "Rx_AAR("ORIG_SESSION_AAR","orig","",-1)", but the PCRF is not contacted and i see the following messages: 5(12153) DEBUG: <script>: Diameter: Orig authorizing media via Rx 5(12153) DEBUG: ims_qos [mod.c:609]: w_rx_aar(): Looking for route block [ORIG_SESSION_AAR] 5(12153) DEBUG: ims_qos [mod.c:621]: w_rx_aar(): Rx AAR called 5(12153) DEBUG: ims_qos [mod.c:1345]: create_return_code(): Creating return code of [-2] for aar_return_code 5(12153) DEBUG: ims_qos [mod.c:1354]: create_return_code(): created AVP successfully : [aar_return_code] 5(12153) DEBUG: ims_qos [mod.c:627]: w_rx_aar(): Can't do AAR for call session in request. Why kamailio says that I Can't do AAR for call session in request? I have looked into source code and I found that the condition that is blocking the communication with PCRF is: //We don't ever do AAR on request for calling scenario... if (msg->first_line.type != SIP_REPLY) { LM_DBG("Can't do AAR for call session in request\n"); return result; } Anyone can help me understand why it is happening? why it can't proceed if isn't a reply? Thank you for your support BR -- José Seabra