I decided to have a play with FOP2. The latest installation instructions have this:
### Manager Credentials Before starting the FOP2 service, some basic configuration is required in *fop2.cfg* and probably in */etc/asterisk/manager.conf* (in many backends you can configure that in */etc/asterisk/manager_custom.conf* ), because the FOP2 daemon connects via TCP to the Asterisk Manager Interface (AMI) using a username and secret. The basic daemon config is covered [here](https://www.fop2.com/docs/installation.php#ConfigurationServer). Once that the files are in place and the manager credentials configured you will have to start the service. There are a number of ways to do that. The best way is to use a proper init script for your distribution, another way is to start it from /etc/rc.local. You can always check if the manager credentials are correctly configured, and also verify if your license is ok, by running the command: ``` /usr/local/fop2/fop2_server --test ```'
There is nothing there about how to configure these files.