Core was generated by `asterisk -vvvg -c'.
Program terminated with signal 8, Arithmetic exception.
#0  0x004e4821 in ?? ()

Then second line:

gdb /usr/sbin/asterisk coredump followed by bt

#0  0x004e4821 in ?? ()
#1  0x02d8c830 in ?? ()
#2  0x00000000 in ?? ()