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ETSI EN 301 657
- Private Integrated Services Network (PISN); Specification, functional models and information flows; Private User Mobility (PUM); Call handling Additional Network Features (ANFs) [ISO/IEC 17877 (2000), modified]
- standard by European Telecommunications Standards Institute, 10/01/2000
- Publisher: ETSI
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Combine previously approved stage 1 and 2 descriptions into a single ECMA standard and align with the stage 3.