The developer of that part (which was developed by SER project during 2005-2008, when Kamailio was separate project, then inherited it as part of SIP-Router project merging) is no longer active. The design is rather complex, without much documentation, but the code is available and you can try to understand and fix issues that you find there. Or ask for a refund :-) ...

Besides this potential issue (which is not confirmed, btw, I just suggested alternative based on code that I am more familiar with and offer same kind of functionality), over the years a couple of other design flaws were reported related to this component, like accumulating memory on value changing because of inactive processes that do not get the chance to update the reference counters.

Independently at that time, Kamailio implemented shared memory variables ($shv(...)) for cases when change of value at runtime via rpc is needed, or local private memory variables ($var(...)) or defines for variables/values that do not need to be changed. The $shv and $var can be initialized via pv modparams. Personally I use these ones because I feel more confident in the code behind them and the ability to fix in case of troubles.

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