>  > +            ^%(log_prefix)s Call from '[^']*' \(<HOST>:\d+\) to extension '\d+' rejected because extension not found in context 'default'\.$

>    It was partially clarified here [1]#227 but as I understand it, it's
>    making an anonymous connection into a asterisk server not relay outbound
>    and cost the owners lots.

hm... really?
from examples such as
http://forums.asterisk.org/viewtopic.php?f=1&t=75259
it just looks to me just as a banal wrong extension provided, not
necessarily outbound.  Oh well -- at least we constrain to 'default'
context, so indeed it probably would primarily track intruders and not
grandmas ;)

-- 
Yaroslav O. Halchenko, Ph.D.
http://neuro.debian.net http://www.pymvpa.org http://www.fail2ban.org
Senior Research Associate,     Psychological and Brain Sciences Dept.
Dartmouth College, 419 Moore Hall, Hinman Box 6207, Hanover, NH 03755
Phone: +1 (603) 646-9834                       Fax: +1 (603) 646-1419
WWW:   http://www.linkedin.com/in/yarik