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I.251.1 : Number identification supplementary services : Direct-dialling-In

Recommendation I.251.1

In force components
Number
Title Status
I.251.1 (08/92)
 
Number identification supplementary services : Direct-dialling-In   In force
 
 
Superseded and Withdrawn components
Number
Title Status
I.251.1 (11/88)
 
Number identification supplementary services : Direct-Dialling-In (DDI)   Superseded

 

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Updated : 2011.03.14