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Line 1: {{short description\|Proprietary protocol providing ISDN services}} ~~{{Unreferenced\|date=January 2008}}~~ {{Use dmy dates\|date=April 2022}} {{Ref improve\|date=February 2024}} '''Digital Access ~~Signaling~~Signalling System 1''' ('''DASS1''') is a [[proprietary protocol]] defined by [[British Telecom]] to provide [[Integrated Services Digital Network\|ISDN]] services in the [[United Kingdom]].<ref>{{cite web \|title=Introduction To Line Telecommunications \|url=https://www.tlc-direct.co.uk/Technical/Telecoms/History/TH022.htm \|publisher=TLC \|access-date=3 February 2024}}</ref> It is now obsolete, having been replaced by [[DASS2]]. This too will become obsolete over the coming years as [[Q.931]], a ~~[[Europe\|~~European]] standard, becomes widely adopted in the [[European Union\|EU]]. ==References== {{Reflist}} {{BT Group}} [[Category:BT Group]] [[Category:History of telecommunications in the United Kingdom]] [[Category:Integrated Services Digital Network]] {{UK-stub}}