I'm using the UAC module in Kamailio to setup about 500 outbound registration towards a single host.

The issue I'm currently experiencing is that when we start Kamailio all this 500 registrations are initiated at once towards the host which can't handle all the requests at the same time.

Therefor I tried to spread the registrations using the reg_random_delay function:

modparam("uac", "reg_random_delay", 60)

I would expect that this would spread the registrations over about a minute but in reality the numbers are sprad as follow: