Hi mate. I have never used a 7961 before but hopefully this will help you out
We use the 7945 and 7965s, I have seen a few do this.
Unplug the power and hold the # Key, Plug the power in. You should see all your line
buttons on the right hand side flash in sequence. At this stage release the # key and dial
123456789*0# This performs a "Full" factory reset.
Hopefully it all works out for you
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