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R4FXO channel did not hang up

Last time, configure r4fxo on trixbox using genzaptelconf command will generate zapata-channels like this.

;;; line="4 FXO/1/3 FXSKS (In use)"
signalling=fxs_ks
callerid=asreceived
group=0
context=from-pstn
channel => 4
context=default

This look ok except context is set to 'from-pstn', I can make outbound and inbound call with out any problem except the call will never hang up!!!. To fix this problem[from this post], change 'context=from-pstn'[bold above] to 'context=from-zaptel'.
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