Hello Daniel, I have a concern regarding auth module, I am running 2000 TPS for 1000000 subscribers, using SIPP. What I observed when you run small load like 500 TPS, everything get passed, but for 2000 TPS With same subscriber.csv file some of the subscribers getting challenged. May I this why auth module is behaving like this.. below are the parameters which I configured in auth module modparam("auth", "nonce_expire", 3600), rest all parameters default values. Regards Surendra