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Windows is kinda stupid. It could your windows phone dialer wondering if it should pick up, or fax software running the background, or it could just be a improperly set network feature. I recently had a client with the same problem.. he was using a very old version of WinFax that locked up his machine when the phone rang because the dumb program was trying to decide if it was recieving a fax or not. I'll definintely look into this and get back to you if I find anything new.
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