Hello. I’ve next problem: sometimes all calls to gateway rejected with 503 error. In debug I’ve seen error: nua_params.c:480 nua_stack_set_params() nua: nua_stack_set_params: entering soa.c:405 soa_set_params() soa_set_params(static::0x7fde8c028f10, ...) called nua_session.c:2318 nua_invite_server_respond() nua: nua_invite_server_respond: entering soa.c:1214 soa_clear_remote_sdp() soa_clear_remote_sdp(static::0x7fde8c028f10) called tport.c:3241 tport_tsend() tport_tsend(0x7fde8c0008c0) tpn = UDP/54.64.74.84:5060 tport.c:4030 tport_resolve() tport_resolve addrinfo = 54.64.74.84:5060 tport.c:4664 tport_by_addrinfo() tport_by_addrinfo(0x7fde8c0008c0): not found by name UDP/54.64.74.84:5060 tport.c:3578 tport_vsend() tport_vsend(0x7fde8c0008c0): 731 bytes of 731 to udp/54.64.74.84:5060 tport.c:3476 tport_send_msg() tport_vsend returned 731 nta.c:6669 incoming_reply() nta: sent 503 Service Unavailable for INVITE (2) nta.c:1341 set_timeout() nta: timer shortened to 500 ms nua_dialog.c:397 nua_dialog_usage_remove_at() nua(0x7fde8c028810): removing session usage nua_session.c:4137 signal_call_state_change() nua(0x7fde8c028810): call state changed: early -> terminated nua_stack.c:271 nua_stack_event() nua(0x7fde8c028810): event i_state 503 Service Unavailable nua_stack.c:271 nua_stack_event() nua(0x7fde8c028810): event i_terminated 503 Service Unavailable Is that means network problem occurred? Best regards, Alexander Mustafin mustafin.aleksandr@gmail.com