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  Home : ITU-T : Publications : Recommendations : I Series : I.251.1 : I.251.1 (11/88)
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I.251.1 : Number identification supplementary services : Direct-Dialling-In (DDI)

Recommendation I.251.1 (11/88)

Approved in 1988-11-25

Status : Superseded

 

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Updated : 2011.03.14