[asterisk-users] Variables sip redirects and call forward

[C F]

First my little Sunday story.
A client of mine with a big factory calls me up that he is trying to
call in to his place because the fire alarm went off. He is dialing
the extension I gave him that will call all the extensions (and worked
before) but after 2 rings he gets a message: The subscriber you are
trying to reach is unavailable (probly from T-Mobile or Cingular). So
I tell him immediately just keep calling back until someone picked up,
I realized that someone must have forwarded their extension (using
local sip forward) to their cell phone, and their cell phone is out of
reach. Sure enough a few hours later when I had a chance to log into
the box, I did my test call and there it was in the CLI calling blah
blah thanks to sip blah at 192.168.24.247 blah blah.
After working with this for around half an hour I just ended up
disabling local forward using the .cfg files from cisco.
So here is my question, is there anyway to determine thru variables
that a phone call is forwarded thru a sip redirect (I think its 302
moved temp)?
Here is my setup:
exten 123 calls a macro that takes a few arguments one of them is the
name of the queue,
the macro in turn calls the Queue, the queue has:
member =sip/1
member = sip/2
member = sip/3
In my case sip/3 was forwarded to an outside number.
so app_queue just followed the sip moved.
Here are my questions:
1. Is there any way to have app_queue ignore redirects?
2. Is there any way to detect in the DP that an extension is called
from a redirect (any varialbes)?
3. While playing around with this problem I tried setting a variable
in the macro that calls the queue using both _VARNAME and __VARNAME
and I was not able to see it anywhere outside the macro that is,
neither was I able to see any of the setvar=VARNAME from sip.conf for
sip/3 in any of the extensions created thru the 302 from sip/3, I also
tried _VARNAME and __VARNAME, is there a workaround to either have the
var from the macro show up everywhere the member it calls end up? or
to have a sip acconts setvar show up even on the channel created from
the 302?

Thank you all.