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ETSI EN 301 133

Integrated Services Digital Network (ISDN); Selective Call Forwarding (SCF) supplementary services (unconditional, busy and no reply); Service description
standard by European Telecommunications Standards Institute, 10/01/1998
Publisher: ETSI

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Stage 1 description of the supplementary service: Selective call forwarding services (Unconditional, busy and no reply)

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