Rod, There's something lurking at the back of my mind (where there's a lot of dust!) which tells me that this is a behavioural thing between iaxRPT and a SIMPLEX node. Have you tried connecting to and working through another node? I had a locally connected repeater configured in simplex mode (I got it into my head to use internal talkthrough, bypassing the DSP). When I connected using iaxRPT I got exactly the same symptoms as you have reported. Now that the node has been configured to full-duplex, iaxRPT works just fine. You may not have done anything wrong after all! Dave GD4HOZ (2480 - 2484)