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Integrated Services Digital Network (ISDN); Digital Subscriber Signalling System No. one (DSS1) protocol; Signalling network layer for circuit-mode basic call control; Part 1: Protocol specification [ITU-T Recommendation Q.931 (1993), modified]
STANDARD published on 15.11.1995
Designation standards: ETSI ETS 300403-1-ed.1
Publication date standards: 15.11.1995
SKU: NS-312782
The number of pages: 68
Approximate weight : 204 g (0.45 lbs)
Country: European technical standard
Category: Technical standards ETSI
Latest update: 2025-08-29 (Number of items: 2 213 600)
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