On ISDN BRI I have to channels (2 simultaneous calls can be made). When both channels are busy I would like to forward it to another ISDN or VoiP number on my Elastix. If I have on the line an ISDN phone (no the elastix system) call forwarding works perfectly, but when I pu the Elastix system online then I get a call waiting signal and no call forward. Is there a setting maybe on misdn.conf??