Hmm, sounds promising indeed!
I tried to make some playground files using those directives ( [official docs](https://www.kamailio.org/wikidocs/cookbooks/devel/core/#trydefenv) ) but they seem broken.
- `#!defenv PORT`: - This should error if PORT env var is not defined. It does not. - If it reads something, it reads it as a string (there is `#!defenvs` for that) because config complaints about the line `port = PORT` with `column 8-13: number expected`, while I have exported with `export PORT=5080`. - same goes for `trydefenv`
I will try and check if these are indeed bugs.
If they work as intended, your template idea should work just fine. But then again, a config file must be edited accordingly to try and check for these vars!
What would be the benefit over a separate config for each new service started?