Summary

������������ This Recommendation provides the general principles associated with ISDN test calls originating from a test system and terminated by a test call responder. It lays down the requirements associated with test calls and lists the facilities that should be provided by a test call responder.

������������ Keywords

������������ ����� bearer type;

������������ ����� ISDN network;

������������ ����� ISDN nodes;

������������ ����� ISDN test calls;

������������ ����� teleservice;

������������ ����� test access;

������������ ����� test responders;

������������ ����� test systems.