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ETSI EN 301 256
- Private Integrated Services Network (PISN); Specification, functional models and information flows; Call interception additional network feature [ISO/IEC 15053 (1997), modified]
- standard by European Telecommunications Standards Institute, 10/01/1998
- Publisher: ETSI
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Contains stage 1 and 2 description of the Call interception additional network feature. See DTR/ECMA-00002 (ECMA-TR/SVC) for a description of the call interception additional network feature. See ENV 41 005 for definition of stage 1 and 2.