Agent Scripting API 409 Conflict During BYOC Failover Context Switch

General Discussion
1

Looking for advice on a specific 409 Conflict error occurring within our Agent Scripting API integrations. This issue manifests exclusively when voice interactions undergo a mid-session carrier failover across our 15 BYOC trunks in the APAC region. The primary carrier occasionally drops SIP packets, triggering our failover logic to route traffic to secondary trunks. While the voice path stabilizes, the scripting context appears to desynchronize, resulting in API failures when attempting to update interaction attributes or execute subsequent script nodes.

The environment details are as follows:

  • Genesys Cloud Release: 2024-08
  • BYOC Trunks: 15 across Singapore, Sydney, and Tokyo
  • SDK Version: Java SDK 15.6.0
  • Architect Flow: Uses Set Interaction Attributes and Data Action nodes post-transfer

Steps to reproduce the issue:

  1. Initiate an outbound call via a dialer campaign configured to use the primary BYOC trunk in Singapore.
  2. Simulate a SIP registration timeout or packet loss on the primary carrier to trigger failover to the secondary trunk in Sydney.
  3. Once the call is connected and the agent accepts it, the Architect flow proceeds to the ‘Update Interaction Metadata’ node.
  4. The flow attempts to push custom attributes (e.g., carrier_failover_event: true) via the Agent Scripting API endpoint /v2/analytics/interactions/query.
  5. The API returns a 409 Conflict error with the message: ‘Interaction context mismatch. Expected carrier ID does not match current routing profile.’

This behavior is inconsistent with standard failover scenarios where the interaction ID remains stable. The error suggests that the scripting engine is locking onto the original carrier’s context ID, which becomes invalid after the SIP re-registration on the secondary trunk. We have verified that the SIP credentials and outbound routing policies are correctly configured for failover. The issue does not occur when the call remains on the primary trunk.

Has anyone encountered similar context synchronization issues during BYOC failover events? Are there specific headers or parameters required in the Agent Scripting API call to refresh the carrier context dynamically? Any insights into the underlying SIP signaling state machine that might explain this lock would be greatly appreciated. We are currently bypassing the script node to avoid blocking the agent workflow, but this results in incomplete data capture for our analytics reporting.

2

If I remember correctly, this 409 conflict during BYOC failover is rarely about the SIP signaling itself. It is usually about how the Genesys Cloud platform handles the session ID when the underlying media path changes. The scripting engine expects a continuous WebSocket connection. When the carrier drops packets and the failover kicks in, the edge might see a new media leg but the API client still holds the old session token. This mismatch triggers the conflict error because the system thinks two different sessions are trying to update the same scripting state.

The suggestion above focuses on the network layer, but try adjusting the JMeter script or your application logic to handle the session refresh. You need to catch the 409 and immediately query the current interaction status before retrying. Do not just retry the same payload. Fetch the latest interactionId and sessionId from the API first.

Here is a basic retry logic pattern in Python that helps with this specific race condition:

def update_scripting_with_retry(interaction_id, payload, max_retries=3):
 for attempt in range(max_retries):
 try:
 # First, refresh the session context if failover occurred
 current_state = api.get_interaction(interaction_id)
 payload['sessionId'] = current_state['sessionId'] # Update with fresh ID
 
 response = api.update_scripting(interaction_id, payload)
 if response.status_code == 200:
 return True
 except Exception as e:
 if "409" in str(e):
 time.sleep(0.5) # Backoff to let edge stabilize
 continue
 else:
 raise e
 return False

The key is synchronizing the sessionId with the new media path before sending the update. The edge needs time to reconcile the trunk change.

Warning: Do not increase your API call rate to fix this. It will cause more 429s. The issue is state synchronization, not throughput. Keep your retry interval low but respectful of the rate limits.