Anyone know why the Genesys Cloud WebRTC softphone returns a 403 Forbidden when the user agent is identified as a migrated Zendesk chat agent? The Architect flow correctly routes the digital channel interaction, but the client-side SDK (v1.0.2) fails to establish the WebSocket connection despite valid JWT tokens. This seems to contradict the documentation stating that digital channel sessions inherit the same security context as voice interactions.
This is typically caused by the Genesys Cloud platform enforcing strict WebSocket connection limits per agent session, which are often exceeded when migrating high-volume digital channels like Zendesk. The 403 Forbidden error on the softphone SDK usually indicates that the underlying WebSocket handshake is being dropped due to concurrency caps or incorrect scope claims in the JWT, rather than a direct SIP trunk issue.
When handling migrated Zendesk interactions, the platform API expects the digital session to inherit specific security contexts. If the JWT token lacks the digital:read or interaction:write scopes explicitly mapped for the migrated user profile, the WebSocket connection fails silently with a 403. Additionally, load testing with JMeter reveals that concurrent WebSocket connections from migrated agents can hit rate limits if the thread count isn’t throttled.
Ensure your JWT generation includes the correct org ID and scope claims. You can verify this by checking the token payload directly. Also, monitor the WebSocket connection attempts using browser developer tools or Wireshark to see if the 101 Switching Protocols response is being blocked.
// Verify JWT scopes in your client-side implementation
const token = jwt.decode(accessToken);
if (!token.scope.includes('digital:read')) {
console.error('Missing required scope for digital channel');
}
For load testing, adjust your JMeter config to simulate realistic WebSocket connection patterns. Set the concurrency limits in your test plan to match the agent’s trunk profile. This prevents the platform from dropping connections due to perceived abuse. If the issue persists, check the BYOC trunk configuration for any strict single-channel limits that might affect digital sessions.
My usual workaround is to…
G’day.
The JWT scopes are likely missing the webphone:use claim for digital channels. Update the OAuth config via Terraform.
resource "genesyscloud_oauth_client" "zendesk_mig" {
scopes = ["webphone:use", "interaction:read", "routing:user"]
}
Redeploy and check the token payload.