The 1995 IN CS-1 Recommendations were developed for the correction of errors or refinements identified by implementors of the 1993 IN CS-I Recommendations (Q.121~)S. pecifically, the 1995 IN CS-1 Recommendations were developed using the following guidelines:1) They contain sure fixes for errors identified in the 1993 IN CS-1 Recommendations. 2) They contain refinements for the 1993 IN CS-1 Recommendations, Le., items that implementors found that needed further clarification. 3) They do not contain enhancements to the 1993 IN CS-1 Recommendations (enhancements are found in the IN CS-2 Recommendations).