Switchboard with 1 telephone line, 4 extensions extendable up to 2 telephonelines and 8 branches. Functions available: intercom, call identifier management,complete management of Telecom services, selectable on-hold music with input for external source, public directory with 40 numbers which can be stored,multi-frequency selection of short numbers, enabling/disabling outgoing callsby prefix and by telephone company, internal follow-me, up to 5 simultaneousconversations, independent wake-up call service for each branch, booking forline or extension engaged and fax detection.Dimensions: 210x142x65 mm (12 DIN modules).