Network Connectivity
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      1. Simplicity VoIP Knowledge Base
      2. TROUBLESHOOTING
      3. Network Connectivity

      Troubleshooting: Network Failure

      Topics Covered: ISP Failure or Degradation and Edge Device - Common Causes and Troubleshooting Steps/Solutions

      ISP Failure or Degradation

      Common Causes

      • Modem/Gateway Failure - If the ISP’s gateway equipment has any problems, the customer’s VoIP service will be degraded.
      • Duplex Mismatch
      • Saturated Transport - This is caused when the bandwidth is not sufficient for the traffic load.

      Troubleshooting Steps/Solutions

      • Modem/Gateway Failure - If the ISP’s gateway equipment has any problems, the customer’s VoIP service will be degraded.

      Contact the ISP

      • Switch to an alternate transport if available.
      • Duplex Mismatch
      • Check the WAN port information on LAN ports for all major network devices including modem/gateways, edge devices, firewalls, and switches that connect to the network edge.
      • Both ports must be set for either half or full duplex. If one port is full duplex and the other side is half duplex, the mismatch will degrade performance.
      • Saturated Transport
      • Optimize QoS and traffic shaping.
      • Calculate bandwidth requirements and increase capacity as needed.