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ITU-T D.251
ITU-T D.251 General charging and accounting principles for the basic telephone service provided over the ISDN or by interconnection between the ISDN and the public switched telephone network
$10.75 $25.00 -57%In StockITU-T D.606R
ITU-T D.606R Preferential rates in telecommunication relations between countries in Africa
$10.75 $25.00 -57%In StockITU-T D Supplement 2
ITU-T D Supplement 2 Method for carrying out a cost price study by regional tariff groups
$10.75 $25.00 -57%In StockITU-T E.401
ITU-T E.401 Statistics for the international telephone service (number of circuits in operation and volume of traffic)
$10.75 $25.00 -57%In StockITU-T E.420
ITU-T E.420 Checking the quality of the international telephone service - General considerations
$10.75 $25.00 -57%In StockITU-T E.421
ITU-T E.421 Service quality observations on a statistical basis
$10.75 $25.00 -57%In StockITU-T E.427
ITU-T E.427 Collection and statistical analysis of special quality of service observation data for measurements of customer difficulties in the international automatic service
$10.75 $25.00 -57%In Stock
