With Max's help I was able to get the p25 repeater working with Asterisk and app_rpt. I connected the audio out to a custom cable connected to my yaesu ft-7800r's data port.

I did notice that if a ctcss tone is not specified a p25 stream will be constantly transmitted. This is the case if using an analog or p25 source.

I still have to play with the levels a bit, but it seems to be working very well.

Also, I was able to talk to other ham's on a local repeater using op25_audio_tx.py. They were able to hear my voice 100% (no dropped packets). This is very good news!

-Ryan KC9GMY