#0  0x400268b7 in pthread_mutex_trylock () from /lib/tls/libpthread.so.0 No symbol table info available.
#1  0x0806c146 in ast_mutex_trylock (pmutex=0x120010c) at lock.h:597 No locals.
#2  0x0806175a in ast_queue_hangup (chan=0x1200040) at channel.c:671
        f = {frametype = 4, subclass = 1, datalen = 0, samples = 0, mallocd = 0, offset = 0, src = 0x0,
  data = 0x0, delivery = {tv_sec = 0, tv_usec = 0}, prev = 0x0, next = 0x0}
#3  0x408fc2d9 in __sip_autodestruct (data=0x81eb518) at chan_sip.c:1315
        p = (struct sip_pvt *) 0x81eb518
#4  0x08056c3e in ast_sched_runq (con=0x8172f78) at sched.c:373
        current = (struct sched *) 0x8174528
        tv = {tv_sec = 1135343875, tv_usec = 693503}
        x = 1
        res = 0
#5  0x40927e28 in do_monitor (data=0x0) at chan_sip.c:11253
        res = 0
        sip = (struct sip_pvt *) 0x0
        peer = (struct sip_peer *) 0x0
        t = 1135343875
        fastrestart = 0
        lastpeernum = -1
        curpeernum = 6
        reloading = 0
#6  0x40024b63 in start_thread () from /lib/tls/libpthread.so.0 No symbol table info available.
#7  0x401ac18a in clone () from /lib/tls/libc.so.6 No symbol table info available.