(gdb) bt
#0  0x0809bfb9 in ast_shrink_phone_number (n=0xe1 "") at callerid.c:869
#1  0xb7cf57f0 in ss_thread (data=0x81deae0) at chan_zap.c:6273
#2  0x00a6d1d5 in start_thread () from /lib/tls/libpthread.so.0
#3  0x007ca2da in clone () from /lib/tls/libc.so.6

(gdb) bt full
#0  0x0809bfb9 in ast_shrink_phone_number (n=0xe1 "") at callerid.c:869
        x = 0
        y = 0
        bracketed = 0
#1  0xb7cf57f0 in ss_thread (data=0x81deae0) at chan_zap.c:6273
        chan = (struct ast_channel *) 0x81deae0
        p = (struct zt_pvt *) 0x812f448
        exten = '\0' <repeats 79 times>
        exten2 = '\0' <repeats 79 times>
        buf = "Ü??ß????á????????ÜÜ??????Ù???????????ìäáìÝÙÛÓÐÒÕÛÙÛÖ?ÙÛß?ß???ÛÝÜä??á?ßÝÝÜ??ÛÛÙÛ?Û??Ù????Ý???ßß???Ü???Ù?ÛÛ?ÙÛÛ???Ý????ÛÛ???ÜÜßÜßÜ?Ü????ÙÛ???Ù?ÙÛ?ÙÛÛ???Ù?ÝÝ?Û????", '\0' <repeats 16 times>, "P\224h?!^v\000\000\000\000\000\000\000\000\000?o?\000Ð??\000\000\000\000\000\000\000"...
        dtmfcid = '\0' <repeats 32 times>, "?\221h?d$?\000&\000\000\000?n}\000?\177\202\000?\221h??\006|\000?o?\000X\224h?Y%?\000\000\000\000\000?e\v\b\027\000\000\000\000\222h?\000\002\000\000\000\224h?\233\017\000\000\035\020\020\b\005\000\000\000\b\223h?\025\000\000\000\001\000\021\000\026\000\000\000\001\000\000\000\204\224h?\000\000\000\000Ð\235h?\000\000\000\000show channels\000set verbose atleast 0\000set debug atleast 0", '\0' <repeats 100 times>
        dtmfbuf = "?\177\202\000\000\230\202\000\bÄ\033\bh\220h??dv\000\000\230\202\000\bÄ\033\b?o?\000\000\000\000\000@\224h??\221h?Ði\t\b\bÄ\033\b\002\000\000\000?\220h?@\000\000\000 \220h?.\020\020\bÌ\221h?\234\221h?vøu\000?\220h?.\020\020\b\000\000\000\000\000\000\000\000\bÄ\033\b\002\000\000\000\030R\021\b\bÄ\033\b\rÄ\033\b\000\000\000\000\000\222h?\000\222h?%\222h??\223h?\000\222h??\223h?", '\0' <repeats 20 times>, "e Ma\000\000\000\000 20:\000\000\0001\000\000\000\000T 2005\000\000\000\000\000\000\000\000\000\000????", '\0' <repeats 16 times>...
        cs = (struct callerid_state *) 0x82aa3c8
        name = 0x0
        number = 0xe1 ""
        distMatches = 238
        curRingData = {339, 313, 258}
        receivedRingT = 6
        counter1 = 0
        counter = 0
        cidcounter = 0
        samples = 63680
        flags = 14
        i = 1
        timeout = 25
        getforward = 0
        s1 = 0xb7689018 ""
        s2 = 0xb7689200 "show channels"
        len = 0
        res = -1
        index = 0
        __PRETTY_FUNCTION__ = "ss_thread"
#2  0x00a6d1d5 in start_thread () from /lib/tls/libpthread.so.0
No symbol table info available.
#3  0x007ca2da in clone () from /lib/tls/libc.so.6
No symbol table info available.


(gdb) f 0
#0  0x0809bfb9 in ast_shrink_phone_number (n=0xe1 "") at callerid.c:869
869     callerid.c: No such file or directory.
        in callerid.c
(gdb) p n
$1 = 0xe1 ""
(gdb) p *n
$2 = 0 '\0'
(gdb) p (char *)n
$3 = 0xe1 ""