| 1. | Ringing and tone for telephone automatic switching network
电话自动交换网铃流和信号音 |
| 2. | Subscriber line signaling system for telephone automatic switching network
电话自动交换网用户信号方式 |
| 3. | Multi frequency register signaling system for telephone automatic switching network
电话自动交换网多频记发器信号方式 |
| 4. | Interoffice junction digital line signalling system for telephone automatic switching network
电话自动交换网局间中继数字型线路信号方式 |
| 5. | Inband pulsing single frequency line signaling system for telephone automatic switching network
电话自动交换网带内单频脉冲线路信号方式 |
| 6. | The test methods for the technical specifications of multi - frequency register signaling for telephone automatic switching network
电话自动交换网多频记发器信号技术指标测试方法 |
