asterisk src

Hi,
Can anyone tell me where (if it's included) the asterisk source is on a standard VicidialNOW install? I need to recompile asterisk to add a codec.
thanks for any advice....
Can anyone tell me where (if it's included) the asterisk source is on a standard VicidialNOW install? I need to recompile asterisk to add a codec.
thanks for any advice....