Thank you Mike,
I was thinking about reversed battery as well, but unfortunately the local PTT wouldn’t support it (also, I think that reversed battery suffers from disconnect supervision, but it is easier to solve though).
Another thing that is running through my head is to use R2 signaling, as the local PTT supports it. The problem is that we have a Quintum with a T1 interface and not an E1…I’ve tried to use it with the default settings of R2 but it didn’t work, I’m just wandering if there is a possibility that it may work? (I don’t have lot of experience with R2).
Does anyone have any idea?