does anyone know why sip trunk registration keeps failing with 403 forbidden when i increase the concurrent thread count in jmeter?
i am running a simple load test to check sip connectivity capacity. using jmeter 5.6.2 from singapore. the test plan sends sip register requests to the genesys cloud sip trunk endpoint.
with 10 threads, everything works fine. registration succeeds and 200 ok is returned. but when i push to 50 concurrent threads, about 30% of the requests fail immediately with 403 forbidden. the error message in the response body says “authorization failed”.
the credentials are correct because low concurrency works. i checked the sip trunk settings in admin and the allowed ip range includes my test server ip. also checked the rate limits for the platform api but i am not sure if sip registration counts towards that.
is there a specific limit on concurrent sip register requests per trunk? or is this a bug with how the api handles parallel auth checks?
here is the jmeter thread group config:
- loop count: 1
- ramp up: 0 seconds
- concurrent threads: 50
any help would be appreciated. stuck on this for two days.