The Simple Dialer is a block added by RFTools. It is a redstone-operated, single-destination form of the Dialing Device.
To configure the Simple Dialer, Sneak right-click the dialer on a Matter Transmitter and a Matter Receiver then place it in the world. When a redstone signal is received by the Simple Dialer, it will activate a link between the paired transmitter and receiver.
Alternatively, if the Simple Dialer is paired with a Matter Transmitter but not paired with a Matter Receiver, activating the Simple Dialer will interrupt any active link.