Consider the following scenario:
You deploy the Response Groups feature in a Microsoft Lync Server 2013 environment.
You configure a Response Group agent group, queue, and workflow. The workflow has a telephone number and an Session Initiation Protocol (SIP) address.
A user signs in to Lync 2013 and then adds the Response Group to a group.
The user tries to forward a call to the Response Group. To do this, the user follows these steps:
In the CALL FORWARDING OFF list, select Forward Calls To and then click New Number or Contact.
In the Forward Calls window, click the contact of the Response Group.
In this scenario, the OK button in the Forward Calls window is unavailable. The window displays the following message:
If OK isn't enabled, you've picked one or more contacts who can't participate in this activity.
To resolve this issue, install the following update:
2880474 Description of the Lync 2013 update: April 2014