Nope, doesn't work so it seems my modification is really necessary...
I will modify what I posted above to remove those underscores, it works as designed now...
If I set it to FALSE I don't get the error message, if I set it to TRUE with my SIP trunk I get the error message since my trunk is not ISDN/PRI...
So it definitely seems to work A-OK now...
Thank you and have a nice day!
Nick