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: I.257.1 |
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| I.257.1�:�Additional information transfer supplementary services : User-to-User Signalling (UUS)
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| In force components |
Number
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Title |
Status |
I.257.1 (10/95)
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Additional information transfer supplementary services : User-to-User Signalling (UUS)
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In force
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| Superseded and Withdrawn components |
Number
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Title |
Status |
I.257.1 (11/88)
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Additional information transfer supplementary services : User-to-User Signalling (UUS)
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Superseded
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I.257.1 (08/92)
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Additional information transfer supplementary services : User-to-User Signalling
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Superseded
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