Reading symbols from /usr/lib/asterisk/modules/format_jpeg.so...done.
Loaded symbols for /usr/lib/asterisk/modules/format_jpeg.so
Reading symbols from /usr/lib/asterisk/modules/cdr_csv.so...
done.
Loaded symbols for /usr/lib/asterisk/modules/cdr_csv.so
Reading symbols from /usr/lib/asterisk/modules/codec_g726.so...done.
Loaded symbols for /usr/lib/asterisk/modules/codec_g726.so
#0  0x40544cfb in chanavail_exec (chan=0x0, data=0x0) at app_chanisavail.c:84
84                              if ((tempchan = ast_request(tech, chan->nativeformats, number))) {
(gdb)
(gdb)
(gdb) bt
#0  0x40544cfb in chanavail_exec (chan=0x0, data=0x0) at app_chanisavail.c:84