Article ID: 2577955 - View products that this article applies to.
Consider the following scenario:
This issue occurs because the register request for the user should not be redirected to the primary registrar. Instead, it should be sent to the backup registrar during a failover. The failover is started when the primary registrar is unavailable and at least one of the backup servers is available.
To resolve this issue, install the following cumulative update:
(http://support.microsoft.com/kb/2571543/ )Description of the cumulative update package for Lync 2010: July 2011
For more information about how to log on to the Lync server, visit the following Microsoft website:
How to log on to the Lync serverFor more information about how to set up Front-end servers and Front-end pools, visit the following Microsoft website:
How to set up Front-end servers and Front-end pools