MJ SIP Development environment

Hello

I would like develop a Java SIP UA(Softphone).For which I have choosen ‘‘mjsip’’.

I got the source code from www.mjsip.org i.e Download MjSip v1.6 toolkit.

But I don’'t know which development environment to use for its development.

I tried to open with ‘‘eclipse’’ IDE but I couldn’'t.

Can anyone of you help me which development environment to use for msip.

where it is available & how to compile ,make it bug free and run through it.