Thread 1 (Thread 0x7f037644d700 (LWP 20100)):
#0  ast_channel_state (chan=0x0) at channel_internal_api.c:864
#1  0x00007f038a2201ce in handle_response_invite (p=p@entry=0x7f03a429d5e8, resp=<optimized out>, resp@entry=183, req=req@entry=0x7f037644c380, seqno=seqno@entry=102, rest=0x7f035c2c0d84 "Session Progress") at chan_sip.c:23131
#2  0x00007f038a222454 in handle_response (p=p@entry=0x7f03a429d5e8, resp=183, rest=0x7f035c2c0d84 "Session Progress", req=req@entry=0x7f037644c380, seqno=102) at chan_sip.c:24174
#3  0x00007f038a233013 in handle_incoming (p=p@entry=0x7f03a429d5e8, req=req@entry=0x7f037644c380, addr=addr@entry=0x7f037644c2f0, recount=recount@entry=0x7f037644c280, nounlock=nounlock@entry=0x7f037644c290) at chan_sip.c:28611
#4  0x00007f038a234b87 in handle_request_do (req=req@entry=0x7f037644c380, addr=addr@entry=0x7f037644c2f0) at chan_sip.c:28921
#5  0x00007f038a236419 in sipsock_read (id=<optimized out>, fd=<optimized out>, events=<optimized out>, ignore=<optimized out>) at chan_sip.c:28852
#6  0x000000000050410a in ast_io_wait (ioc=0x28b5340, howlong=<optimized out>) at io.c:292
#7  0x00007f038a21254f in do_monitor (data=data@entry=0x0) at chan_sip.c:29451
#8  0x0000000000598daa in dummy_start (data=<optimized out>) at utils.c:1223
#9  0x00007f03dc6710a4 in start_thread () from /lib64/libpthread.so.0
#10 0x00007f03ddd3bfed in clone () from /lib64/libc.so.6

23131             if (ast_channel_state(p->owner) != AST_STATE_UP) {
23132                 ast_log(LOG_WARNING, "Ringing or 183.\n");
23133                 ast_verb(1, "Setting Ringing for 183 (Non-RFC)\n      ");
23134                 ast_setstate(p->owner, AST_STATE_RINGING);
23135             }