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Line 1: {{Unreferenced\|date=January 2008}} '''Digital Access Signalling System 1''' ('''DASS1''') is a [[proprietary protocol]] defined by [[British Telecom]] to provide [[Integrated Services Digital Network\|ISDN]] services in the [[United Kingdom]]. It is now obsolete, having been replaced by [[DASS2]]. This too will become obsolete over the coming years as [[Q.931]], a [[Europe]]an standard, becomes widely adopted in the [[European Union\|EU]]. {{BT Group}}

Digital Access Signalling System 1: Difference between revisions