The CCITT, considering that Recommendation F.23 gives a recommended grade of service for groups of long-distance international circuits used in the gentex service but; that it would be helpful for outgoing countries to be certain that the gentex calls can be put through with a loss probability sufficient to maintain the grade of gentex service without delay working;that small offices connected to the gentex network cannot ensure, at the incoming end, a very high grade of service, otherwise their equipment would be uneconomically used.
ITU-T F.24 SPANISH-1993 Referenced Document
ITU-T F.23 GRADE OF SERVICE FOR LONG - DISTANCE INTERNATIONAL GENTEX CIRCUITS
ITU-T F.24 SPANISH-1993 history
1993ITU-T F.24 SPANISH-1993 AVERAGE GRADE OF SERVICE FROM COUNTRY TO COUNTRY IN THE GENTEX SERVICE