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ETSI EN 301 255
- Private Integrated Services Network (PISN); Inter-exchange signalling protocol; Message Waiting Indication (MWI) supplementary service [ISO/IEC 15506 (1997), modified]
- standard by European Telecommunications Standards Institute, 10/01/1998
- Publisher: ETSI
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Contains stage 3 description of the message waiting supplementary service. See DTR/ECMA-00002 (ECMA-TR/SVC) for service description. See ENV41005 for definition of stage 3.