[Freeswitch-users] freeswitch sending '481 Call Does Not Exist' in return of BYE

Hello, Here are the sip traces of two legs leg1 UAC -> proxy -> media leg2 media -> proxy -> provider leg1 http://pastebin.com/G0jnF75t leg2 http://pastebin.com/299dZyN4 from leg1, when freeswitch(media) is sending back 480 temporarily unavailable after 183 session progress, UAC is sending ack and bye, now in return freeswitch is sending '481 Call Does Not Exist' my question is why? why freeswitch is sending 481 in return of ack and bye? here, 11.23.16.12 is UAC 11.23.16.13 is Opensips(Proxy) 11.23.16.16 is Freeswitch(Media) Thanks, Devang Nathwani