Re: SIP software instead of Gizmo
April 1st. Anyway, the software recommendation still stands ;)
SIP software instead of Gizmo
For those who prefer OpenSource for their SIP software, Ekiga (formerly GnomeMeeting) (http://www.ekiga.org/) might be a suitable alternative to Gizmo.
(I have the gut-feeling, that Gizmo will give the same binary trouble as e.g. Skype: i.e. compatibility problems for source based distro's and always behind in development compared to the windows version).
Ekiga can also be used conveniently with several pre-paid PC-to-Phone services, such as VOIPstunt.