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You can troubleshoot network issues from the public switched telephone network (PSTN) to the Mediation Server as follows:

1. Ping the IP address of the PSTN gateway from the Mediation Server. If there is no answer, there is a connectivity issue.
   
   
2. Check the event log of the Mediation Server for error messages that could be relevant. For details about relevant Office Communications Server events, see Appendix A: Enterprise Voice-Related Events.
   
   
3. Start Performance Monitor and add the Mediation Server – Inbound Callsobject. This enables you to view the Mediation Server counter values. For details about relevant Office Communications Server performance counters, see Appendix B: Enterprise Voice-Related Performance Counters.
   
   

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