Computer Mixer Headset Mixer Intercom

Basically I need to have up to 4 computer headsets (including the microphones) combined just like an intercom. So total hole = 4 sets of headphone and microphone computer jack. Each with volume control. With another Computer Input jack (that will be connected from computer speaker out also with volume controls) With another Computer Output Jack (this is the combined microphones above, to be connected to Computer Microphone in (the pink hole)) The mics sounds should be loud enough. I need 5 items of this is to be shipped to Indonesia once finished