I have a zap/dahdi channel setup as outgoing only. The incoming calls on that line are picked up manually. See this thread for further info: http://www.elastix.org/index.php?option=com_fireboard&Itemid=55&func=view&catid=3&id=35100 The problem that I am having is, when I dial out, Elastix will pickup the zap/dahdi channel without checking if it is already in use. This results in dtmf tones being sent over an active call and the Elastix call not going through. Is there a way to ensure that Elastix checks to make sure the line is not in use by another system prior to dialing? I thought that the system would check for dialtone prior to attempting to dial, but it does not seem to do that. I am using a TDM400P card with one FXO channel on it. Thanks.