(gdb) bt
#0  0x40397c51 in check_user_full (p=0x811a008, req=0xbedfe7a4,
    cmd=0xbedfe9b8 "SUBSCRIBE", uri=0xbedfe9c2 "sip:55555@68.146.204.32",
    reliable=0, sin=0xbedfe794, ignore=0, mailbox=0xbedf6594 ",,",
    mailboxlen=320) at utils.h:21
#1  0x0811aa2c in ?? ()
#2  0x4038ec58 in handle_request (p=0x811a008, req=0xbedfe7a4, sin=0xbedfe794,
    recount=0x140, nounlock=0xbedfe72c) at chan_sip.c:7473
#3  0x40389f6f in sipsock_read (id=0x8113948, fd=14, events=1, ignore=0x0)
    at chan_sip.c:7658
#4  0x080526e0 in ast_io_wait (ioc=0x8114fa0, howlong=320) at io.c:267
#5  0x4038480c in do_monitor (data=0x0) at chan_sip.c:7806
#6  0x4002ee31 in pthread_start_thread () from /lib/libpthread.so.0
(gdb)