I've been playing with Zoiper for just a couple of hours and I'm fascinated with the ease of use in terms of regitering my SIP account that's an A+ in my book.
The problem I'm facing now is that once I've installed the product and it started, I can't start the interface without using sudo to do so, when I don't use it, this is what I get:
sh: 1: kde-config: not found
The program 'zoiper' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadMatch (invalid parameter attributes)'.
(Details: serial 835 error_code 8 request_code 2 minor_code 0)
(Note to programmers: normally, X errors are reported asynchronously;
that is, you will receive the error a while after causing it.
To debug your program, run it with the --sync command line
option to change this behavior. You can then get a meaningful
backtrace from your debugger if you break on the gdk_x_error() function.)
Other than that it worked fine!