3 comments on “Cisco IP Phones De-Register from Call Manager

  1. Thank you for such a clear and well-written account of an adventure in troubleshooting. As a techie, I find this very entertaining.


  2. This helped us immensely. We had a single fiber link in an etherchannel going into err-disabled state causing STP to regenerate about every 5 minutes. I doubt I would have found this issue without reading this article.


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