PUBLICATIONS OF THE ITU-T SECTOR 3. Implementation guidelines Guidelines for Preparing and Conducting Field Trials of Digital Switching Equipments 1987 MEDIA PRICE CHF LANGUAGE ARTICLE ISBN PAGE NBR EFS 1116 1117 1118 92-61-02951-5 92-61-02952-3 92-61-02953-1 20.- ISDN Field Trial Guidelines 1991 MEDIA PRICE CHF LANGUAGE ARTICLE ISBN PAGE NBR EFS 2067 2066 2068 92-61-04461-1 92-61-04462-X 92-61-04463-8 118 103 103 38.- 61 EFS 38.- Guidelines for Implementing a Signalling System No. 7 Network 1991 MEDIA PRICE CHF LANGUAGE ARTICLE ISBN PAGE NBR EFS 92-61-04391-7 92-61-04392-5 92-61-04393-3 1910 1909 1911 37.-