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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 5443-1985 |
The test methods for the technical specifications of ringing and tone for automatic telephone switchingnetwork 电话自动交换网铃流和信号音技术指标测试方法 |
China National Standards ringing |
 English PDF |
| GB 3380-1982 |
ringing and tone for telephone automatic switching network 电话自动交换网铃流和信号音 |
China National Standards ringing |
English PDF |
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