[SR-Users] Problem at Rx Interface - kamailio P-CSCF 5.1.6

Hi all, We are using kamailio 5.1.6, configured as P-CSCF, facing following problem. Please indicate, if you need further information - e.g. I could provide a tshark trace. If during call setup (by simulated UAs) at the terminating P-CSCF the simulated PCRF rejects the Diameter AAR message, then the kamailio P-CSCF runs into a questionable behaviour. By calling the Rx_AAR() function in configuration, the processing of the 200 OK is suspended (by the ims_qos module) and then resumed with the receipt of the AAA message. Now the ims_dialog module is called with the dlg_terminate("all", "reason") function, but the 200 OK has not yet been sent. The ims_dialog sends CANCEL downstream and 488 upstream. However, the 200 OK is sent additionally. We would rather have expected the ims_dialog module should send BYE in both directions. When we respond the CANCEL with 481 Call/Transaction does not exist (which we MUST according to RFC 3261), then we would expect the ims_dialog module at least now to react with BYE in both directions. Could you help? What's our misunderstanding? How could we proceed to get this issue fixed? Kind regards Christoph P.S.: This is a retransmission, because the original message did not pass moderator approval due to the attached tshark trace The information contained in this e-mail message is privileged and confidential and is for the exclusive use of the addressee. The person who receives this message and who is not the addressee, one of his employees or an agent entitled to hand it over to the addressee, is informed that he may not use, disclose or reproduce the contents thereof, and is kindly asked to notify the sender and delete the e-mail immediately.