We just deployed the updated firmware (5.7.0) to a few of our VVX 501 phones but have been having account lockout issues ever since. When signing into the phone using BToE or direclty through the web interface the phone will log the user into Skype but immediately lock out the user account and fail to connect to Exchange. I can tell from the logs that the lockouts are being returned by the Skype servers with an error (the username is correct but the password is wrong). Why after the phone successfuly authenticates the user into Skype is it still attempting to login in? Has anyone else noticed this behavior?
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I have not found the cause of this issue and I am still investigating. This seems to have only happened after the upgrade to 5.7.0 so I'm not sure if something changed with the authentication method in this update.