Pre-occupation

Pre-occupation, Total:3 items.

The international standard classification for "Pre-occupation" includes: .

The Chinese standard classification for "Pre-occupation" includes: .

Danish Standards Foundation

• DS/ETS 300199:1995 Integrated Services Digital Network (ISDN); Call Forwarding Busy (CFB) supplementary service -Service description
• DS/ETS 300203:1995 Integrated Services Digital Network (ISDN); Call Forwarding Busy (CFB) supplementary service -Functional capabilities and information flows
• DS/ETS 300129:1993 Integrated Services Digital Network (ISDN); Malicious Call Identification (MCID) supplementary service. Functional capabilities and information flows

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