trunk DNs not showing as busy

I have configured my UC520 in hybrid mode with some phone having buttons for DNs configured as trunks and other phones having to dial "9" to get a line. With this setup if an phone configured with a trunk DN picks up the line all other ephones using this same DN show the DN as busy. However, when a phone that dials "9" takes a line the phones with the trunk DN do not show it as busy. Is there a way I can get the buttons with the trunks show as busy when they are in use via a phone that dialed "9" to get out?

Thanks,
Diego

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Should be possible, check

Should be possible, check the option fxo monitor with trunk.

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