[App_rpt-users] PTT Question w/iaxRPT and HT's connected to Node

Hello All, I was wondering if any of you have seen this with iaxRPT and app_rpt - but - if I keep all settings the same - and I set invertptt=0 - iaxRPT works fine - audio through that gets copied out and HT's receive just fine - but; when I try to talk with the HT's - audio isn't received - node radio receives but the audio isn't xmitted through. Now, if I set invertptt=1 - then the HT's can xmit and iaxRPT 'hears' it - but now iaxRPT cannot xmit. Has anyone seen this issue? Hopefully just a config issue I have missed. Maybe a weak pull-up or pull-down on PTT is needed? 73's, John AJ6BC