Unless there is still an issue despite the fix, I'm going to close this issue. @miconda, I'm planning to backport it to 4.4 branch too, but this patch will now make kamailio fail to start if the **http_async_client** module is loaded before **pv**. This is the way it always have been documented, but until now it worked no matter what the loading order was. Is it ok to backport it anyway?