[SR-Users] call control for 4.2?

Hi, I want to experiment with the following setup and was wondering which module(s) you all recommend. I have a working simple kamailio 4.2 setup where registered users can only call each other on the same domain (ie no outbound calling to PSTN or other domains). Now I want to explore the possibility of limiting call times for certain users but allowing unlimited call times for others (ie user 5000's calls are limited to 2 minutes while user 6000 has unlimited calling time). There are some tutorials available on the internet but they seem to be quite outdated. Given my simple scenario, should I be looking into using the callcontrol module and install the CDR tool from here http://callcontrol.ag-projects.com/ (I don't really need any complex billing scheme with various rates but rather a simple scheme were user x is either time limited or not). Before I dig in any further, I'd appreciate it of someone could tell me if this is the way to go or is there's a simpler solution. Are there any recent tutorials that I should be looking at? Cheers, Peter