additional Microphones CP960

[someone]

How Many wireless microphones can be connected to this Phone? I called the distributor about an order number for additional mics, but I was told there is no item that can be sold.
However, everywhere you can but a set of two mics.

But that does not necessarily mean this can be used to add more microphones, it could be just an addition to the CP960 which can be bought without microphones.

I would like to have 6 microphones connected to the base. Is that possible?

TIA