Echolink on Android works well with modest data and CPU usage.
Audio can be:
- wired headphones work normally, the microphone in the headphones works. You have to manually select them with the speaker icon on the top right of the app
- Bluetooth works poorly for me on Android and Blackberry, bad/missing RX/TX audio. Others have noted these problems too. I can tell the HSP (headset profile) is being selected.
Most people will be using “relay” connections, which precludes one-to-one connections
I wish the Echolink network stack would be upgraded to not require firewall ports to be opened, this causes some extra difficulty for users. I think most people have been using Triggered Port Forwarding to have their router send Echolink traffic to them as their IP changes on their LAN/WLAN. Or they have used Proxy Servers and now the relay method.
Skype has managed to do one-to-one connections without firewall port opening for a very long time, also using direct one-to-one and one-to-many data connections with the server used only a broker to facilitate the initial call setup.