The single channel siptosis start command (SipToSis_linux) does not start x or skype. You have to do it.
X should be started first. Start Skype, Start SipToSis.
If you can't start an X display or skype, it's a problem with X or skype.
1. You don't tell me linux distro
2. what happened when you tried startx?
3. what happened when you start skype?
4. Is Skype running and logged in or not?
If I have to pull teeth to get info, I'm not going to help - especially for free.
Why don't you use the stsTrunk_linux command? You only need to start X first.