Integrated Services Digital Network (ISDN); Call Hold (HOLD) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 1: Protocol specification (Endorsed by AENOR in September of 2003.)
STANDARD published on 1.9.2003
Designation standards: UNE-EN 300141-1V1.2.4
Publication date standards: 1.9.2003
Approximate weight : 300 g (0.66 lbs)
Country: Spanish technical standard
Category: Technical standards UNE