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I have a CS410 with 4x snom 320 handsets connected and a Cisco SPA8000 ATA that connects 5x analogue handsets (total 9 extensions active on the CS410). Everything was working fine until I upgraded the firmware over the weekend from 4.3.0.5020 to 4.3.0.5021. After that the SPA8000 couldn't log in the 5 extensions and I was getting error messages every hour saying that the SPA8000's IP address 'has been blacklisted for 60 minutes because there were 5 unsuccessful authentication attempts (sip)'. After each hourly attempt, the system error log had an error message saying: '3rd party registration licenses exceeded (1 > 0)'. My licence status information still showed that I was licensed for 10 extensions and everything else on that page looked the same as previously. The only way I could get the CS410 to register all 9 extensions again was to change the licence key to a free demonstration licence, which allows up to 10 extensions to register. Any ideas on why the licence key that came with the CS410 and had worked with all the previous versions of the firmware suddenly changed behaviour after upgrading to 4.3.0.5021? Is it possible to get a replacement licence key issued for my CS410 that will work properly to allow all 9 extensions to connect again rather than using a demonstration licence? Does the demonstration licence expire after a period of time?