What is the 6560 Speakerphone and what is it for? Does it always have to be installed with the Vimar intercom in Sound System?

The ELVOX part no. 6560 serves to integrate Vimar Intercoms (part no. 20555 - 20555.N - 20555.B - 14555 - 14555.SL) in Sound System and should be installed as close as possible to the Elvox power supply, connecting it according to the wiring schemes provided and upstream of the other devices installed.