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� Home : ITU-T : Publications : Recommendations : I�Series : I.253.1
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I.253.1�:�Call completion supplementary services : Call waiting (CW) supplementary service �

Recommendation I.253.1

In force components
Number
 Title Status
I.253.1 (07/90)
� 		Call completion supplementary services : Call waiting (CW) supplementary service � In force
�
�
Superseded and Withdrawn components
Number
 Title Status
I.253.1 (11/88)
� 		Call completion supplementary services : Call waiting � Superseded

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