asterisk users - Oct 2013 - Dahdi not detecting hangup when analog forwarding

Hello,

I've got a test setup with 2 asterisk boxes:

Asterisk1 with:
asterisk 11.5.1
dahdi 2.7.0.1
Digium TDM400 with 2 FXO ports

Asterisk2 with:
asterisk 11.5.1
dahdi 2.7.0
Digium TDM400 with 2 FXS ports


Asterisk1 has the following AEL  Dialplan:

context remote {
    s => {
        Answer();
        Dial(DAHDI/g1/7005);
    };
};


When a call from Asterisk2 comes in, it is correctly entering the above
remote context and an extension on Asterisk2 receives an incoming call:
bothe Asterisk extension are talking to each other and everything run fine
(two ways audio) except that hangup is not detected by Asterisk1 (no matter
which Asterisk2 extension is hanging up):

- Asterisk2 shows non ongoing call,
- Asterisk1 show 2 living channels: I need to kill one of them to restore
expected status.

When I'm using another dialplan with which an incoming call is passed to a
local extension, hangup is correctly detected.


Am I trying to do something that can't be done (forwarding from one line to
another) ?
Any clue ?
Suggestions.

Regards
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After posting her, I've found this thread
http://forums.asterisk.org/viewtopic.php?f=1&t=83088

In it I read:
" The normal PSTN behaviour is calling party clearing, with a timeout of 2
to 6 minutes if the called party is the only one that clears."

Can someone explain a bit further why "calling party clearing" keeps
"analog forwarding from working" ?
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