SS-ETS-300359-2 › Complete Document History
Integrated Services Digital Network (ISDN) - Completion of Calls to Busy Subscriber (CCB) supplementary service - Digital Subscriber Signalling System No. one (DSS1) protocol - Part 2: Protocol Implementation Conformance Statement (PICS) proforma spe
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EDITION 1 - ENGLISH LANGUAGE EDITION - Nov. 10, 1995
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