Some telephones, depending on the brand and model, have the intercom function, which allows to begin communication by sending the signal. When the signal comes, the telephone set rings a signal different from the standard ring tone call. After that the telephone temporarily switches off from the telephone line and works as an intercom.
WorldOne Communications buys and sells surplus telecommunications and VoIP equipment. We stock Acme Packet, Nextone, and Sonus Networks equipment.
If you have excess equipment, we may be interested in buying it, or we can help you sell it. If you need