ETSI EN 300 403-1
- 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 by European Telecommunications Standards Institute, 11/01/1999
- Publisher: ETSI
$32.00$63.00
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