(gdb) bt
#0 0x08090f25 in ast_rtp_pt_clear (rtp=0x0) at rtp.c:656
#1 0x40f191fc in process_sdp (p=0x86b8338, req=0x412ff7d0) at chan_sip.c:2811
#2 0x40f291c0 in handle_response (p=0x86b8338, resp=200, rest=0x412ff9f0 "OK", req=0x412ff7d0, ignore=0) at chan_sip.c:6895
#3 0x40f2cf41 in handle_request (p=0x86b8338, req=0x412ff7d0, sin=0x412ff7c0, recount=0x412ff7ac, nounlock=0x412ff7b0) at chan_sip.c:7890
#4 0x40f2d3e1 in sipsock_read (id=0x812ed68, fd=15, events=1, ignore=0x0) at chan_sip.c:7961
#5 0x08052f2c in ast_io_wait (ioc=0x8111868, howlong=846) at io.c:267
#6 0x40f2db24 in do_monitor (data=0x0) at chan_sip.c:8109
#7 0x400329dd in start_thread () from /lib/tls/libpthread.so.0
#8 0x4019effa in clone () from /lib/tls/libc.so.6