(gdb) bt
#0  ast_rtp_destroy (rtp=0x81a6b68) at rtp.c:1083
#1  0xb7b1f17e in __sip_destroy (p=0x819eb40, lockowner=1) at chan_sip.c:2112
#2  0xb7b14479 in sip_destroy (p=0x45544956) at chan_sip.c:2265
#3  0xb7b1d738 in __sip_autodestruct (data=0x819eb40) at chan_sip.c:1317
#4  0x08056478 in ast_sched_runq (con=0x8129f30) at sched.c:373
#5  0xb7b28eba in do_monitor (data=0x0) at chan_sip.c:11281
#6  0xb7f9673e in pthread_start_thread () from /lib/libpthread.so.0
#7  0xb7e8a08a in clone () from /lib/libc.so.6
(gdb)