Stuck on WebSocket connection drops when simulating 100 concurrent softphone logins via JMeter 5.4.1. The Genesys Cloud SDK v2.0.50 returns a 1006 abnormal closure before the SDP answer is received. This happens consistently after 45 seconds of idle keep-alive packets.
The environment is standard US-East region. We are hitting the documented WebSocket connection limits, but reducing concurrency to 50 does not resolve the handshake timeout. Is there a specific configuration in the Architect flow or the API call for POST /api/v2/users/{id}/softphone that needs adjustment for high-volume load testing?
The docs actually state that WebSocket stability relies heavily on proper keep-alive intervals matching the server expectations, which is a stark contrast to Zendesk’s ticket-based polling. In Zendesk, we were used to simple HTTP requests, but Genesys Cloud’s real-time media requires persistent connections that are much more sensitive to idle timeouts.
This 1006 error usually indicates the server closed the connection because it didn’t receive a ping or data within the expected window. When migrating from Zendesk’s asynchronous model, it is easy to overlook these low-level network configurations. The JMeter script might be sending keep-alives too frequently or with the wrong payload structure, causing the Genesys Cloud gateway to drop the session as a security measure.
WebSocket closed abnormally (1006) before SDP answer received. Idle timeout exceeded after 45s.
To fix this, adjust the JMeter WebSocket sampler settings. Ensure the “Ping interval” is set to 20-30 seconds, not 45. Also, verify that the JMeter script is using the correct Sec-WebSocket-Protocol header value, specifically genesys-cloud-voice.
In Zendesk, we didn’t have to worry about SIP signaling or WebRTC handshakes, but here, the SDP exchange is critical. If the handshake fails, the media never starts. Try adding a small delay between the WebSocket open and the SDP offer to ensure the connection is fully established.
Also, check if your JMeter load generator is behind a proxy or firewall that might be interfering with the WebSocket frames. Genesys Cloud is strict about clean TCP connections. Switching to a direct connection or configuring the proxy to allow WebSocket upgrades often resolves these intermittent drops.
This migration from a ticketing system to a unified communications platform means we have to pay much closer attention to network infrastructure. It is a steep learning curve, but understanding these WebRTC fundamentals is key to a successful Genesys Cloud deployment.