Hello, On 3/28/12 4:23 PM, Ryan Gholam wrote: dialog is the module you can use in kamailio to track active calls and can be used to terminate them. What you can do is to get the max duration of the call at setup (via sqlops to a database or http request to a billing engine) and set it in the dialog. You can update the dialog timeout at runtime, dialog from devel branch is more flexible in this regard: http://kamailio.org/docs/modules/devel/modules_k/dialog.html Siremis (http://siremis.asipto.com) includes a basic SQL-based billing engine, used in postpaid fashion -- it may help to build your own. Cheers, Daniel -- Daniel-Constantin Mierla Kamailio Advanced Training, April 23-26, 2012, Berlin, Germany http://www.asipto.com/index.php/kamailio-advanced-training/