Excellent SIP phone client. If it doesn't work for you, it's bad setup, the application is great.
The best among open source sip phone so far
Tried a few other sip phones before gong with Linphone. Good UI, sound volume, call quality and stability. Can't comment on how good it is for multiple accounts as I only use one right now.
App is always loosing password in SIP-account. Therefore, "registration failed". Have to insert password every time when entering.
I recommend this. Am using this with my VoIP service provider and simply excellent it works like a charm, it's performance on mobile data is superior amazingly enough, than on my workplace WiFi (QOS suspect).
- Boot on Android O device