You can troubleshoot voice quality issues that are related to the PSTN as follows:

  1. Perform test calls between an Office Communicator 2007 R2 client and a PSTN telephone.

  2. Use Monitoring Serverto identify which Mediation Servers and IP/PSTN gateways were used and how other calls through the corresponding Mediation Server performed.

  3. View the server health report in Monitoring Server Reporting Console to see trends of call quality at each Mediation Server over time.

  4. Rule out codec configuration issues, Secure Real-time Transport Protocol (SRTP), and other IP/PSTN gateway compatibility issues. For details about gateway configuration, see Enterprise Voice Deployment Requirementsin the Planning and Architecture documentation. For issues that appear to be associated with the IP/PSTN gateway, consult the gateway vendor to verify your configuration.

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