All this talk of Android IAXRPT got me interested. I installed it (v1.13). Sometimes when I connect to my node, the PTT on the node will stick on. There is no indication of this in the app and no audio going through, just dead air. (Luckily I had a radio monitoring and discovered this issue quickly.) Other times I connect and it works just fine--PTT follows the PTT button. What's going on here? Why does it transmit without PTT pressed? On IAXRPT for Windows (running in Wine on OS X), PTT behaves correctly. I also have Zopier set up, but I configured this for VOX. I hit the mute button when I don't want to transmit. It works just fine. Relevant configuration stanzas below. (Let me know if you need more.) Tom KD7LXL iax.conf: [iaxrpt] username=iaxrpt type=friend context=radio-gui auth=md5 secret=xxx host=dynamic disallow=all allow=gsm allow=ulaw allow=g726aal2 notransfer=yes [tomsphone] Íž Zoiper Setup username=tomsphone type=friend context=tomsphone host=dynamic auth=md5 secret=xxx disallow=all allow=ulaw allow=g726aal2 allow=gsm codecpriority=host transfer=no callerid="KD7LXL" extensions.conf: [radio-gui] exten => 41702,1,rpt(41702|X) exten => 1001,1,rpt(1001|X) [tomsphone] exten => 41702,1,answer() exten => 41702,n,Playback(rpt/connected) exten => 41702,n,rpt(41702|Pv) exten => 1001,1,answer() exten => 1001,n,Playback(rpt/connected) exten => 1001,n,rpt(1001|Pv)