Is there a clean way to handle 429 Too Many Requests when initiating high-volume outbound campaigns via API?
We are running a load test with JMeter 5.6.2, simulating 1000 concurrent campaign start requests. The POST /api/v2/outbound/campaigns endpoint throttles us after 50 requests per second. We are in the us-east-1 region. Is there a specific header or pacing strategy in the Architect flow to avoid this bottleneck during peak load simulation?
You need to implement exponential backoff for the 429 responses. The rate limit is a hard ceiling on the API gateway, so pacing requests via JMeter is the only way to stay compliant.
In my experience with schedule publishing bursts, adding a random jitter to the retry delay prevents thundering herd issues. Check the Retry-After header in the response to set your initial wait time.
The best way to fix this is to shift the pacing logic from the load testing tool directly into the Genesys Cloud Architect flow, utilizing the “Pause” action with a dynamic duration. Relying solely on JMeter for exponential backoff often fails to account for the specific latency introduced by the BYOC trunk registration status checks that happen in parallel during campaign initialization. When managing fifteen trunks across APAC, I have observed that the API gateway throttles not just the campaign creation, but also the subsequent SIP credential validation calls.
Error: 429 Too Many Requests - Retry-After: 5s
Instead of a static retry, configure a JavaScript snippet in the Architect to parse the Retry-After header and inject a jittered pause (e.g., Math.random() * 1000 + headerValue). This ensures the outbound routing logic respects the carrier-specific failover windows, preventing the thundering herd effect that typically crashes the SIP registration state during peak hours in the us-east-1 region.