International Telecommunication Union   ITU
Français  Español
 
Site map Contact us Print version
  Home : ITU-T : Publications : Recommendations : Q Series : Q.120-Q.139
Recently posted -  Search Recommendations -  Shopping cart
   
Q.120-Q.139 : Specifications of signalling system No. 4

Recommendation Q.120-Q.139

In force components
Number
Title Status
Q.120-Q.139 (11/88)
 
Specifications of signalling system No. 4  
Initially published in Blue Book Fascicle VI.2 (1988). Available now in electronic format only
In force

 

Top -  Feedback -  Contact us -  Copyright © ITU 2008 All Rights Reserved
Contact for this page :  ITU-T Publications
Updated : 2014-09-17