Hi, I have just made some tests with sst-module (OpenSER v1.3) and I found the following two issues: I case the min-se value of sst-module is higher than the Session-Expires header field of a received INVITE OpenSER rejects the INVITE request with 422 response (that's as expected). But: 1. the Min-SE header field in 422 response (packet 18 in attached trace) does not end with CR/LF so that it is concatenated with the next header field (Server header) syslog prints in this case: ERROR:sst:sst_dialog_terminate_CB: DID 0xb5582d80 failed (canceled). Terminating session. 2. OpenSER in addition continues to forward the already rejected INVITE transaction with "100 Giving a try"(packet 19) and forwards the INVITE to the UAS (packet 20). The next issue I discovered is with the UAC (Xlite): The repeated INVITE (caused by the 422 Response) does not increment the CSeq header field so that it is regarded as same request leading to a "482 Merged request" rejection at the UAS (Eyebeam). I have attached the tcpdump-trace and the according SIP-scenario trace. Any comments appreciated. Regards Franz