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CUPC 8.5.x Fast Busy Issue

I am running CUPC 8.5.x on Windows 7 and Windowd XP PCs and recently inbound calls to the extension assoicated with this install ring fast busy when i answer the call. sometimes also get the same fast busy when i try to make an outbound call. Instant message function works okay and only voice is affected. If i run IP Communicator the inbound or outbound calls work fine. I have removed and reinstalled the software, tried using another extension in client but the issue has not been resolved. I have over 50 CUPC users and this is only occuring with a handful of installs.

Thanks for any help or recemendations offered!


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