Webex Calling (Desktop) – Calling Fails or Drops

Issue / Error

Users may experience calling problems in Webex, including:

  • Calls not connecting
  • Calls dropping after a few seconds
  • Unable to transfer or place calls on hold

Cause

These issues commonly occur due to network shaping, VPN conflicts, or Webex Calling services failing to register. Guest Wi-Fi networks often block traffic required for calling.

Solution

Calling Troubleshooting Steps

  1. Check registration:
    • Go to Settings → Calling.
    • Look for the status "Registered".
  2. If not registered, restart the Webex app.
  3. If registration still fails, restart the computer to reset the network stack.
  4. If connected to a VPN, disconnect and test again:
    • Webex often works better while off-VPN.
  5. Verify that required firewall ports are not blocked.
    • Guest Wi-Fi networks commonly restrict SIP and Webex Calling traffic.

Real-Life Example

A user’s calls dropped after 20 seconds when working from a café. The guest Wi-Fi was blocking SIP traffic. Switching to their mobile hotspot resolved the issue immediately.

Environment

  • Webex App
  • Webex Calling
  • VPN connections
  • Guest Wi-Fi networks
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