Reverse Charge Indication

Hi Guys!

I am trying to block/unblock the collect calls over my PRI channel. In the past, we used to patch LIBPRI and all channel was blocked or unblocked. Since Asterisk 1.8, it is possible to allow/disallow using dialplan. Here we are. The option is Channel®.

How is possible to add this variable under Freepbx?

I tried in Asterisk Settings, Dialplan. The default is Ttr. I did put TtrR … no sucess.

Any tip?

Thanks alot!
Denilson.