Hi for All. I have a question. Application based on pjsip make Disconnect (Hang-up) operation. Application check call state - is CONNECTED and send BYE message. In this moment Bye message was received from network by transport layer. Is it checking situation in sip stack layer (sip event thread): application making hang-up, but BYE message received from network, then will be sent "200OK" (response but not request)? Thank you! Regards, Sergey 21.01.2011