Introduction 1-11. IntroductionChapter 1 IntroductionThe ROLMphone 120, 240, and 400SeriesThe ROLMphone 120, 240, and 400 series of multi-featured phoneshave many options that enhance their functionality. Your ROLMphonemodel may have a display, a speakerphone, from 12 to 40 feature keys,and multiple extensions.These digital telephones work with your company’s SiemensCommunications Server to give you advanced, easy-to-use telephonefeatures. The communications server is your facility’stelecommunications system.The RP240 and RP400 are multi-line telephones; the RP120 is asingle-line telephone. The RP240E and RP400 each have a display.