測試項目:

1>發送頻率響應:Sending frequency response (SFR);

2>發送響度:Sending loudness rating (SLR);

3>接收頻率響應:Receiving frequency response (RFR);

4>接收響度:Receiving loudness rating (RLR);

5>側音掩蔽評定值:Side tone masking rating (STMR);

6>聽筒側音值:Listener side tone rating (LSTR);

7>電話聲耦合損耗:Telephone acoustic coupling loss (TAL);

8>回聲損耗:Echo loss (EL);

9>穩定度余量:Stability margin;

10>發送失真:Sending distortion;

11>接收失真:Receiving distortion;

12>側音失真:Sidetone distortion;

13>空閒信道噪聲(發送/接收):Idle channel noise: Sending/Receiving;

14>環境噪聲抑制:
Ambient noise rejection.

其中第1,2,3,4,5,10項是CTTL要求測試的。
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