This specification discloses a telephone system suitable for use as a private branch exchange and includes a switching network for establishing call connections between station line circuits, trunks and registers under electronic common control. Each register comprises control circuitry for switching a multifunctional counter circuit into a plurality of configurations on a single call for initially scanning stations to detect call service requests, then counting dialed pulses transmitted from a calling station, and subsequently scanning stations on a callback operation to identify the calling station.