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U.12 : Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling)

Recommendation U.12

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
 
 
Superseded and Withdrawn components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and transit control signalling system for telex and similar services on international circuits (type D signalling)   Superseded

 

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Updated : 2009/10/30