We use the permission module on kamailio 4.2.5. with the  "allow_trusted()" function, to check if a customer has to be whitelisted or not.

With the "tag_col" we define the user that is linked to the specific matching IP. 

Now we have the problem that a specific IP could be liked to multiple accounts, so the tech prefix is what we thought to use in order to fix this without involving others files or modules.

Permission module, only allows to apply the regex against the from header, and we'd like to do this against the request URI instead.

We have patched the permission module locally in order to have the possibility to chose witch field kamailio has to consider (From, or request URI).

Before sending a pull request, we'd like to know from you if this change is something you may want to take in consideration.

Thanks

Nexmo Team