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] (Endorsed by AENOR in July of 2005.)
NORMA vydaná dňa 1.7.2005
Designation standards: UNE-EN 300403-1V1.3.2
Publication date standards: 1.7.2005
Approximate weight : 300 g (0.66 lbs)
Country: Spanish technical standard
Kategória: Technické normy UNE