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This topic describes how to troubleshoot the noise in the line.
Symptom
There is noise in the line.
Possible Causes
The possible causes are as follows:
ϒ⁄The network is abnormal.
ϒ⁄The unified gateway is not grounded.
ϒ⁄The terminal is faulty.
ϒ⁄The device gain is improper.
ϒ⁄The peer device is abnormal.
ϒ⁄The clock source has not been configured.
Procedure
1.Connect the ground line again on the unified gateway to check whether the fault is rectified
ϒ⁄If the fault is rectified, the troubleshooting process is complete.
ϒ⁄If the fault persists, go to the next step.
2.Change the terminal to check whether the fault is rectified.
ϒ⁄If the fault is rectified, the troubleshooting process is complete.
ϒ⁄If the fault persists, go to the next step.
3.See Network Analysis to check whether the network is normal.
ϒ⁄If no, verify that the network cables are connected properly.
ϒ⁄If yes, go to the next step.
4.See Volume Is Low or High to reduce device gains and check whether the fault is rectified.
ϒ⁄If the fault is rectified, the troubleshooting process is complete.
ϒ⁄If the fault persists, go to the next step.
5.Check whether the devices at the two ends use the same DSP codec.
ϒ⁄On the unified gateway, run the show mrsparas command to check the value of TdmCodec
ϒ⁄Run the config modify asi by aulaw command to change the value of TdmCodec.
ϒ⁄Check whether the fault is rectified. If the fault is rectified, the troubleshooting process is complete. If the fault persists, go to the next step.
6.See E1/T1 Trunk Exception whether the clock source is configured.
ϒ⁄If no, configure the clock source. Then, check whether the fault is rectified. If the fault is rectified, the troubleshooting process is complete. If the fault persists, go to the next step.
ϒ⁄If yes, go to the next step.
7.Contact the peer office's engineers to check whether the peer device runs normally.
ϒ⁄If no, contact the engineers for the peer device to rectify the fault.
ϒ⁄If yes, go to the next step.
8.If the fault still persists, collect detailed fault information and related logs by referring to Collecting and Reporting Fault Information and send them to the service provider.
Parent Topic: Call Faults