You deploy the Response Group Service (RGS) in a Microsoft Lync Server 2010 environment.
You create a response group queue that has queue overflow enabled. Additionally, you configure the call action settings for when the queue overflow threshold is met.
Some users call into the RGS.
The RGS successfully transfers the incoming calls to some agents.
The queue overflow threshold is not met.
In this scenario, RGS redirects a new incoming call to the queue overflow call action unexpectedly.
Note The expected action is that the new incoming call either waits in the queue or is transferred to an available agent.
This issue occurs because of a race condition in the RGS. The race condition prevents a successfully-handled call by the RGS from being deleted from the database. When multiple calls are not deleted, the queue overflow threshold is exceeded. Therefore, the queue overflow call action is triggered.
To resolve this issue, install the following cumulative update:
2847888 Description of the cumulative update for Lync Server 2010, Unified Communications Managed API 3.0 Runtime: July 2013
For more information about how to create a response group queue, go to the following Microsoft website: