Call to a RGS number cannot be transferred to an available RGS agent in Skype for Business Server 2015-based client Content provided by Microsoft Applies to: Skype for Business Server 2015 Select Product Version All Products When this issue occurs, a user who makes a call hears continuous music in loop when the call waits to be transferred to a Response Group Service (RGS) agent. Resolution To resolve this issue, install the June 2015 cumulative update 6.0.9319.55 for the Microsoft Skype for Business Server 2015 Response Group Service. Last Updated: Jun 23, 2015 Did this solve your problem? Yes No Tell us what we can do to improve the article Submit Thanks! Your feedback will help us improve the support experience.