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ETSI EN 300 485
M00001163
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ETSI EN 300 485 Integrated Services Digital Network (ISDN); Definition and usage of cause and location in Digital Subscriber Signalling System No. one (DSS1) and Signalling System No.7 ISDN User Part (ISUP) [ITU-T Recommendation Q.850 (1998), modified]
standard by European Telecommunications Standards Institute, 10/01/1999
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