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2. 1-5-7-1 - Wikipedia

   en.wikipedia.org/wiki/1-5-7-1

   To its mobile telephone business customers BT Group provides a 1571 Voicemail service, which is similar to the service provided to landlines. Calling parties can leave messages when the mobile telephone is switched off, when it is in an area of reduced coverage, when it is on another call, or when the call is not answered within a fixed number of rings.

3. Digital Access Signalling System 2 - Wikipedia

   en.wikipedia.org/wiki/Digital_Access_Signalling...

   Digital Access Signalling System 2 (DASS2) is an obsolescent protocol defined by British Telecom (BT) for digital links to PSTN based on ISDN. Although still available on request, it has been superseded by ETS 300 102 ("EuroISDN"). DASS2 is an improved version over DASS1, based on experiences with DPNSS.

4. Digital Private Network Signalling System - Wikipedia

   en.wikipedia.org/wiki/Digital_Private_Network...

   DPNSS was developed in the early 1980s by BT, or its forerunner, Post Office Telecommunications in recognition that the emerging Digital Private Circuit Primary Rate product 'Megastream' had to address the market for both data and voice, the latter being significantly greater because of the market for PBXs. At the time, BT dictated what ...

5. Digital access carrier system - Wikipedia

   en.wikipedia.org/wiki/Digital_Access_Carrier_System

   Digital access carrier system (DACS) is the name used by British Telecom (BT Group plc) in the United Kingdom for a 0+2 pair gain system. Two Telspec DACS remote units mounted on a pole Usage

6. BT Consumer - Wikipedia

   en.wikipedia.org/wiki/BT_Consumer

   BT Consumer provides fibre-to-the-cabinet (FTTC) and fibre-to-the-property (FTTP) broadband, IPTV and mobile services nationally, as well as providing access to the BT Wi-Fi hotspot service. Since 2020, BT Consumer has begun preparing for the 2025 switch off of the public switched telephone network (PSTN) by introducing their Digital Voice ...

7. Landline - Wikipedia

   en.wikipedia.org/wiki/Landline

   The VoIP replacement is known as "Digital Voice" (on a BT service) in the UK. France, Germany and Japan are also in the process of replacing theirs. [20] By means of porting, voice over IP services can host landline numbers previously hosted on traditional fixed telephone networks. VoIP services can be used anywhere an internet connection is ...