I guess the function was supposed to be called only for the initial INVITE, the one that creates the call.

Overall, I do not use that much the module to have an opinion of this is good to have or someone also wants to charge a call twice (e.g., incoming leg and outgoing leg). The initial developer of the module is not active lately in the project, maybe @linuxmaniac can give his opinion as I saw some commits to this module from him rather recently.

As a further remark, the protection could be good, but if there are cases to charge a call many times, then it should be made a modparam to control the behaviour.

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