Hello, I have got the same issue with my phone, which is an LG D605 (Optimus II L9) running Android 4.4.2.
I have tried some other phones running the same Android version (and even lower...): the server installed correctly on them! So Android version is not the issue.
I made some deeper investigations: I found out that the server application needs the SIP VOIP capability (of course..), which is included in Android, but it seems that some branded phones have SIP support removed!
I have seen some apps that allow using SIP even on my phone: they don't rely on the stock Android SIP library, maybe it's possible to use this way to make SIP calls?
Many thanks for your attention
Mauro, IK2WPO