How should I properly to handle authentication in a high-concurrency SIP load test? Running JMeter with 500 concurrent threads against Genesys Cloud PSTN. Getting 403 Forbidden on SIP INVITEs after 100 calls. Using static auth headers in the script. Is there a rate limit on SIP registration or call setup? Here is the payload:
{"to": "+15550199", "from": "+15550100", "auth": "static"}