What is the state of the Softphone? Is it showing register currently? what is the type of softphone you are using CIPC??
Can you try one thing
Close the softphone application completely
From Windows Machine goto Start>Run >regedit
Delete the Softphone folder under HKEY_CURRENT_USER> Software> "Softphone"
Then run the softphone as administrator again and see if you are getting the same error
Br,
Nadeem
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