Reading symbols from /usr/lib/asterisk/modules/chan_sip.so...done.
Loaded symbols for /usr/lib/asterisk/modules/chan_sip.so
Reading symbols from /lib/libnss_dns.so.2...done.
Loaded symbols for /lib/libnss_dns.so.2
#0  0x4d554e44 in ?? ()
(gdb) bt full
#0  0x4d554e44 in ?? ()
No symbol table info available.
#1  0x0807549e in ast_pbx_run (c=0x40bba870) at pbx.c:1889
        c = (struct ast_channel *) 0x81afca8
        digit = 0 '\0'
        exten = '\0' <repeats 255 times>
        pos = 0
        waittime = -1
        res = 0
        digit = 0 '\0'
        exten = '\0' <repeats 255 times>
        pos = 0
        res = 0
#2  0x0807c3bf in pbx_thread (data=0x40bba870) at pbx.c:2126
No locals.
#3  0x400210ba in pthread_start_thread () from /lib/libpthread.so.0
No symbol table info available.
(gdb)