How to limit call duration

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edit - edited since it was first posted. Inexperienced users should never use the from-pstn-custom context.

There may be other ways, but one way is to put lines like this in /etc/asterisk/extensions_custom.conf:

[from-pstn-limited]
exten => _.,1,noop(Limiting maximum call duration)
exten => _.,n,Set(TIMEOUT(absolute)=3600)
exten => _.,n,Goto(from-pstn,${EXTEN},1)

Then set the trunk context to from-pstn-limited in the trunk peer details with the line:

context=from-pstn-limited
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