Loaded symbols for /lib/libnss_files.so.2
#0  0x0805bb2c in ast_read (chan=0x8181f18) at channel.c:86
86              if (!chan->pvt->pvt) return 1;
(gdb) bt
#0  0x0805bb2c in ast_read (chan=0x8181f18) at channel.c:86
#1  0x0807c2e4 in pbx_builtin_congestion (chan=0x8181f18, data=0xffffffff) at pbx.c:4345
#2  0x080749af in pbx_exec (c=0x8181f18, app=0x80f9548, data=0x7d5fd864, newstack=1) at pbx.c:469
#3  0x0807caab in pbx_extension_helper (c=0x8181f18, context=0x8182070 "sipext", exten=0x8182164 "1704", priority=4,
    callerid=0x8181f18 "4▒▒*4▒▒*-9d60", action=135090103) at pbx.c:1277
#4  0x08076a0b in ast_pbx_run (c=0x8181f18) at pbx.c:1758
#5  0x0807d101 in pbx_thread (data=0x0) at pbx.c:1981
#6  0x2aad0dfe in pthread_start_thread () from /lib/libpthread.so.0
#7  0x2ac729aa in clone () from /lib/libc.so.6