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: U.12 |
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U.12 : Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling) |
In force components |
Number
|
Title |
Status |
U.12 (03/93) |
Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling)
|
In force
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Superseded and Withdrawn components |
Number
|
Title |
Status |
U.12 (11/88) |
Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling)
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Superseded
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