[SR-Users] Question about rate limiting a subscriber

I have a customer who has just started operating a dialer. Over the past couple of days this dialer has been creating some minor issues with our US48 termination. We are currently running Server:: Kamailio (1.5.1-notls (x86_64/linux)). I would like to limit on a subscriber by subscriber basis the amount of outgoing calls per second that they can do. I am reading through the ratelimit module documentation, but haven't been able to determine if I can use it to limit one particular subscriber outgoing activity. I have also looked at the pike module, and think that I may be able to use it in order to limit calls per second by IP. Does anyone have any recommendations, suggestions, or examples that can be used to control the calls per second based on the kamailio subscriber name. Stagg Shelton VocalCloud