[Serusers] Call Admission Control on SER

Hi all, I have a very urgent question and I would know if anyone is dealing with CAC on SER....exist any methods/function in statefull proxy mode to count simultaneous calls coming from the same calling party number (from HF), feeded from one IP PBX (like Asterisk) with just one single digest account and one permitted uri, in case setting two call thresholds (one for the allowed simoltaneous calls and one for the allowed call per second)? If yes, is it possible blacklisting/barring this user (in a cached table with function like file permission.deny) for some time/forever if the call counters exceed limit settled by the above threshold? Thanks for your reply !! Verbal