Call queuing is required to process inbound calls to PBX or contact center, callers are put into queue where they wait for a free operator and listening to some music. IVR usually notifies a caller about his position in a queue and about estimate waiting time. Operators have controls to set their availability, because some time is required to put data about previous call before answering the next one. VoxImplant has all capabilities required to build contact center functionality including ACD (Automatic call distributor) that can be controlled using the ACD Module. In this tutorial we will build a simple queue that is being processed by operators with the same skill set.