I would suggest contacting a dealer until you find one who will sell you a maintenance contract for the phone. Last I checked, over a year ago, they were somewhere around $10-$20. Once you have a contract you may register online and download all the software you need. However to use legally you would have the pay the ~$50 license fee for SIP.
That is only true if your phone is a 7940/7960 (not G). The 7940G/7960G are legally allowed to be used with SIP firmware, if you have rights to obtain it.
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