I do mean CHAN_SIP. I used port 5060 because on the FreePBX Extension Menu it says “This device uses CHAN_SIP technology listening on Port 5060 (UDP)”
I changed it to 5160 but it still won’t connect. No change in behavior. There are advanced settings in the soft phone of:
Domain: Blank
Outbound Proxy: Blank
Registration Interval: Blank
Authentication Username: Blank
Transport: UDP