[asterisk-users] Dahdi not detecting hangup when analog forwarding

[Olivier]

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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