The system allows two-way phonic connection between stations distributed on a production line or in a factory.

The “CONFERENCE” mode: means 1 station speaks, all others hear. No selective calling. All telephones are connected in parallel on a telephone line. The networks can range from 2 to several tens of stations. The operating mode is alternating. Each operator must press a button to speak. The power of these stations allows their use in noisy environment, and very noisy.