asterisk users - Dec 2009 - Repost: Working in useful examples... and freenum/e.164 dialing in extensions.conf.example

I've recently decided to spend idle cycles while waiting for various
Astlinux platform builds to complete on making the contents of asterisk/config a
little more complete, a little more useful, a little more real-world...

I started looking at the possibility of taking JTodd's ISN Freenum cookbook
example and updating it:

http://freenum.org/cookbook/#ASTERISK_CONFIG

but ran into some problems having to do with the following:  we use SIP handsets
in house, and those operate in the redfish-solutions.com domain... but anonymous
SIP (freenum) calls coming in off the internet would also be in the same domain.
I can't figure out how to separate calls in the same domain (but from
different endpoints) in two different contexts.

And unfortunately, doc/ doesn't cover sip.conf, nor does the Asterisk
Reference Manual cover it in much detail... except for a couple of related
topics (shared line appearances and dahdi integration, I think).

So if anyone can contact me and work off-line on getting a reasonably useful and
real-world applicable example working, I'll file a documentation defect and
push for getting this checked in (as I did for a few other examples).

Thanks,

-Philip