asterisk users - Aug 2008 - Asterisk - forcing PSTN Line "ON" Hook

Is there a way to force "PSTN" line on ATA (Linksys / Sipura) to go
"ON" hood via dial plan?

I have two Linksys units one connected to old POTS line and one connected via
Shaw Digital Phone.
The one connected to Shaw Digital Phone the PSTN Line fails to go ON Hook at the
end of the conversation.

I know the caller (PSTN caller or VoIP caller), if the call is not a
ring-thru-Line-1 or forwarded call can enter **# to force the SPA to take the
FXO port
on-hook to disconnect the PSTN line.  
But I'm the receiver of the call.

The problem is that if the PSTN line fails to disconnect the call goes to Voice
mail.
Standard POTS line works perfectly the PSTN Line goes ON Hook every time at the
end of the call but not the Shaw Digital Phone

-- 
#Joseph
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