asterisk users - Nov 2005 - Problem with multiplier

Hi all,
i've a problem on a PSTN line that i've connected to Asterisk server
with a
Diginum Card. A diagram:

               +------[Fax Machine]
               |
[PSTN]----+
               |
               +------[Asterisk]

The problem is if i pick up the phone on Fax Machine i get no Dialtone. If i 
disconnect asterisk cable all goes ok. I think the problem is because Diginum 
Card detect the "off hook" and take the line. Can i solve this ? 

Thanks, Michele

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