Should the client side of Web Call Server be located on Linux server? Can we deploy it on Windows server?

The client side can be located anywhere either on Linux, Windows or other OS machine because the client-side contains web scripts and files only, such as: Javascript, CSS, images, Flash, HTML etc.
Therefore the client side can be deployed either on Linux server such as apache or nginx or on Windows server using a Microsoft web server product or for example apache for Windows.