Softphone WebRTC handshake failure during schedule publish window

Voice & Telephony
1

Can anyone clarify why our agents are hitting WebRTC connection drops specifically when the weekly schedule publish completes? We are in the Chicago region (US East) running Genesys Cloud Release 2024.10. The issue seems tied to the moment the WFM scheduler pushes the final state to the real-time presence engine. Agents report the softphone disconnects and fails to reconnect with a handshake error. The browser console shows a specific STUN failure right after the schedule status changes from ‘Pending’ to ‘Published’.

We checked the Architect flows and nothing is changing. It feels like a race condition between the WFM data sync and the signaling server. The error log from the client side looks like this:

WebSocket closed abnormally: code 1006
STUN binding request failed: timeout after 3000ms
Signaling connection lost during state transition

This happens to about 15% of our agents during the Monday morning publish window. Is there a known limit on concurrent state updates for the WebRTC stack? We need to ensure agents stay online while the schedule locks in. Any insights on mitigating this handshake timeout?

2

{ “max_concurrent_calls”: 1, “rate_limit_burst”: 50 }

If I remember correctly, the schedule publish triggers a presence refresh that spikes WebSocket connections. Try throttling the agent connection rate in the load test config to see if the handshake succeeds with lower concurrency.
3

This is actually a known issue… The WFM service account needs explicit Presence: Read permissions. In Zendesk, schedules lived in a separate app, but Genesys Cloud ties them tightly to telephony presence. Grant that permission and the handshake should stabilize.

Note: Verify the service account isn’t blocked by WFM scope restrictions.

4

Oh, this is a known issue. The presence refresh triggered by the schedule publish often overwhelms the real-time signaling layer before the agent client can re-establish the secure handshake. While the permission adjustment mentioned above is necessary for service account visibility, the client-side connection stability requires a different approach.

To mitigate the handshake failure during the publish window, configure the following in the agent softphone settings:

  1. Enable the “Reconnect on Presence Change” flag in the user profile telephony section.
  2. Increase the WebSocket keep-alive interval to 15 seconds to prevent premature timeout detection.
  3. Ensure the browser’s WebRTC permissions are set to “Always Allow” for the Genesys Cloud domain to bypass prompt delays during the spike.

This configuration forces the client to prioritize the existing signaling channel rather than initiating a full renegotiation when the schedule state updates. Aligning these settings with the standard performance views usually stabilizes the connection during high-concurrency events.