General System features / 237P0992640 03 Modular ICS 6.0 System Coordinator GuideInternal numbersEach telephone in the Norstar system has its own internalnumber. The length of internal numbers in your system can befrom two to seven digits on a non-expanded system, and threeto seven digits on an expanded system. All numbers in yoursystem are the same length. Your installer or customer servicerepresentative sets the length of internal numbers, called theDN length. The default DN length is three.To find out your internal number, use the Button Inquiryfeature (²¥â) on an intercom button. On the M7100 orthe T7100 sets, Button Inquiry shows your internal number,followed by the function assigned to your single-memorybutton.Line assignmentAny of the lines in your system can be assigned to any of yourtelephones. Your installer or customer service representativeassigns lines to telephones in Configuration programming.Lines can be assigned to appear only, appear and ring, or toring only.Usually, only the lines that are appropriate for a particularperson appear at their telephone. When a line is assigned to atelephone, it is automatically given a line button on thattelephone, if a button is available. The M7100 and the T7100sets do not have line buttons.Calls on lines that ring but do not appear at a telephone arepresented at an intercom button.You may be able to answer a call on a line that does not appearor ring at your telephone. To pick up such a call, use CallPickup, Call Park, or Trunk Answer.
