page_title: Analog Display Services Interface
section_title: Compatible equipment
hierarchical_section_title: Analog Display Services Interface / Compatible equipment
caption_attribution_description: English: Picture of PHILIPS P100 Screen Phone
context_page_description: Analog Display Services Interface is a telephony technology that is used in plain old telephone service or computer-based private branch exchange telephone service. It works in conjunction with a screen-based telephone or other compatible customer-premises equipment to provide the user with softkey access to telephone company or internal PBX custom calling features. It is an analog service because it uses analog frequency-shift keying technology to interact with an LCD screen via short, low-baud rate, downloads to refresh and re-program softkeys in real-time.
  The technology introduced in the United States and rolled out to Regional Bell Operating Companies from Bellcore in April 1995, was marketed by the RBOCs who implemented it, as a way to streamline all available custom calling options through the use of a screen-based telephone; giving Residential and Small Business telephone subscribers PBX-like functionality at home or in small office/home office locations at a significantly lower cost.
context_section_description: U S West Communications, the first local RBOC to offer this service, marketed it as "Home Receptionist" service.  Home Receptionist service included a Nortel Powertouch (or Vista) 350 screen-based telephone and "line-provisioning" service to make it work.  This service is still offered by Qwest Communications (the successor to US West), BellSouth and SBC Communications; though the service has different marketing names.
  Nortel discontinued the x5x telephone line and introduced a more streamlined version called the 39x-line and then later the 48x-line in 1998.  CIDCo and Cybiotronics later introduced their own lines of screenphones after the original Nortel Patent expired.  
  Nortel sold off its CPE line to Aastra Technologies in 1999 and Aastra continues to market these telephones through various channels.
  Philips Austria manufactured a Screen Phone model called the P100. It was sold throughout the US and several European countries.
caption: P100 Screenphone (Swedish version)
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