The IP address is listed in this variable in the logfile (strParticipantName = x.x.x.x:1720)
Thank you Joe for the help and confirmation that it is working. Have a great day.
On my successful (audio/video both ways) Android test call to your HDX, I was using local WIFI thru my Comcast internet connection. I also used 4G Wireless data connection successfully as you saw. It looks like there might be an iPhone RPM issue.