Recommendation I.251.3 (11/1988): Number identification supplementary services: Calling Line Identification Presentation (CLIP)
superseded recommendation/international standard from the International Telecommunication Union
ITU Telecommunication Standardization Sector
Number identification supplementary services: Calling Line Identification Presentation (CLIP)
Recommendation I.252.1 (11/1988): Call offering supplementary services: Call Transfer
Recommendation I.252.2 (11/1988): Call offering supplementary services: Call Forwarding Busy (CFB)
Recommendation I.252.3 (11/1988): Call offering supplementary services: Call Forwarding No Reply (CFNR)
Recommendation I.252.4 (11/1988): Call offering supplementary services: Call Forwarding Unconditional (CFU)
Recommendation I.252.5 (11/1988): Call offering supplementary services: Call Deflection (CD)