[Freeswitch-users] Limiting Calls Per Second

Hi All. I have a client that needs a second Freeswitch server and I need to figure out how to handle her 'calls per second' limit. Currently, although not perfect, it is not a big deal - I simply decrement or increment a column in a database. However, I am concerned that with a second server, I may run into collisions, etc. What is the best practice to have two servers accurately measure calls per second? Is there a module I can use or something without re-inventing the wheel? Thanks! Alex