Phonerlite is a very good phone ! , but with some missing features it can be lot better. 

- It would be nice to support multiple lines in phonerlite. Right now I know there are profiles, but having multiple lines is very useful. Each line with its own configuration. And and an option for each line with a fallback line if one line doesn't register. 
So Line 1, Line 2, Line 3, ... Line 10 say
- Each line has its own options for TLS, SRTP, ZRTP etc.
- Each line has two options : 
   a) Use this line only as fallback - Yes/No
   b) Fall back line number - Give a line number (give 0 if don't need a fallback line)

First option tells if the line is fall back line only. This means if it is set to Yes, it does not register/activate unless some other line it is acting as fall back to doesn't work. If option is set to No, then it registers regardless of any other line.

Second option tells which line to move to (and register) if current line is selected and it doesn't register.

So if I have Lines 1 & 2 setup and Line 1 fails registration by indicating a fall back line 2 for it, phonerlite will automatically register line 2 and if user selects line 1, it will move to line 2 automatically. If line 2 option a) says No, then it will register regardless of line 1. If line 2 option a) says Yes, then it will register only if line 1 registration fails and line 1's fall back is line 2.

This would be a great feature addition and is similar to some softphones and hardphones like in snom