AnalogueAnarchy
Casual Member
What is the under pinning architecture of BT payphone networks ? I noticed that all BT payphones since the late 90s / early 2000s have the ability to send SMS texts and some even email. Does this mean they have a dedicated end to end ISDN line or a special SMS-only modem then gets packetized for mobile distribution at the MDF ? I always assumed a traditional POTs voice-only line didn't facilitate a digital text message regardless of how small in size and so must therefore be ISDN ?























