Overview

You are applying home routing to ported-out (MNP) subscribers to another operator network, but there is no response from their SMSC to the external party GT.

An SRI-SM request is received from international links to your SMSC, the SMSC triggers the SRI-SM towards STP PC, receives a positive ack returned with the operator IMSI but does not respond back to the external party GT.

Workflow

Instructions

1. Analyze the Wireshark trace of the scenario.
2. If the problem is with the SRI-SM response from the operator SMSC to the RTR: Check if the STP sent this response to the RTR on its VPC while the RTR started the dialog using its OPC.

   Normally, in this case, the response should be received on the RTR side on its OPC not on the VPC otherwise, the RTR will treat it as a new incoming request.

   So, to resolve this issue, you need to fix the configuration from the STP side to route the responses to the RTR on its OPC.

3. This behavior could be related to the configuration of SRI-SM routing rules, so check the configuration that was applied during the scenario.

   It can also be helpful to check:

   • A normal trace of the same scenario after the changes are rolled back or before the change was made, in order to compare the difference in behaviors.

   • Are there any other MTOR and SRI-SM rules with conditions based on IMSI or SMSC GT from the operator that were applied during the testing?

   • /var/log/messages and /usr/TextPass/etc/<hostname>_config.txt from the affected server/s.

   • A tp_walkall output from one of the RTRs to double-check the configuration.

4. Check the FWL SRI-SM Republishing functionality.