本标准中给出的程序可用于确定部分和完整电话连接的响度等级。对于完整的电话连接，包括整体和侧音传输路径，程序包括测量声音输入和输出压力。对于包含发送、接收或连接路径的部分电话连接，程序包括测量声压和电压。

The procedures given in this standard may be used for determining the loudness rating of partial and complete telephone connections. For complete telephone connections, comprising overall and sidetone transmission paths, the procedures involve measurement of acoustic input and output pressures. For partial telephone connectiond comprising transmitting, receiving, or connection paths, the procedures involve measurement of acoustics pressures and electric voltages.