If you have an iPhone and also a sipgate.com account you might want to connect them.
Fro the App Store I installed iSipSimple, which is free.
Then, go to www.sipgate.com/faq click in the drop down list on the right and select SipPhone on iPhone. The pops-up a window with all your config information. You MUST note that your username and password are NOT those you use with the Sipgate web interface, or the Sipgate desktop application!
It should all work!