Phone A calls Phone B, Phone B is Call Forward NA, Call Forward Busy to Phone C
B does not answer, it rolls call to C.
If C does not answer.
Phone A gets Phone C, VM not the original caller (Phone B).
How can I fix this?
I cant find any parameter in Voice Mail configuration
Sincer you are using FreePBX, you need to consult the FreePBX people.
The way that FreePBX works is that you set the configuration via WebGUI and FreePBX generates Asterisk .conf files. So if something does not work in the configuration made via FreePBX, FreePBX is to blame
If you want to make your own dialplans - then you are at the right place