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Connection Failure Through the SS7 Trunks

Publication Date:  2015-07-15 Views:  467 Downloads:  0
Issue Description
The SoftCo fails to connect to the upper-level office device through the SS7 trunks.
Handling Process
Step 1 Run the Show board command to view the indicator status of the DTU.

If the signal loss indicator LOS is on, the signals are lost; if the indicator is off, the signals are normal. If the remote alarm indicator RFA is on, the peer device is faulty; if the indicator is off, the peer device is working properly.

Step 2 Verify that the following information of the local office is consistent with that of the peer office:
  • Local signaling point code
  • Destination signaling point code
  • Trunk direction
  • Trunk line selection mode
  • Circuit identification code (CIC) of the start trunk circuit
  • Signaling link code (SLC) of the MTP link
  • Circuit number timeslot of the MTP link
Step 3 If the fault persists, contact Huawei technical support engineers.

Root Cause
The possible causes are as follows:
  • The board is faulty so that the physical channel is not connected.
  • Settings on the SoftCo are inconsistent with those on the peer device.