Passing DTMF on local repeater

Well if it were ASL to ASL, you can simply connect in command mode…
*4xxxxxx and issue the needed commands to the connected node. Then # to end.
And actually, I would suggest that for reasons of future expansion and your time.

As far as the relay control, you might take a peek at some of my posts for site control.

(just to present you with options to think on)