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Ringing on the Called Phone in the SoftCo Continued

Publication Date:  2015-07-15 Views:  474 Downloads:  0

Issue Description

A user uses a mobile phone to call a number in the SoftCo through the AT0 trunk. If the calling user hangs up before the called user answers the call, the phone of the called user continues ringing for about 1 minute.

Handling Process

Step 1 Verify that the ATU is grounded properly.

Step 2 If the fault persists, contact Huawei technical support engineers.


Root Cause

The possible causes are as follows:
  • The amplitude of the received busy tone signals is lower than the scope that the SoftCo can detect, that is, -10±3Db.
  • The AT0 trunk module is affected by the static electricity because the device is not grounded or the ground is poor.