I'm using linux inkscape for console, version 0.9, it works great as it allows me to specify conversion parameters such as resolution, dpi, etc.
However when I use vector format files (such as .AI for example) which have some custom font used, the final outcome of the process produces a PNG image with font replacement used, probably with some of the system fonts.
You can see the example here, the top display is from the original .AI file, and the bottom one is from the inkscape generated PNG.

Anyone have any idea why is this happening and how to prevent it? As far as I know vector formats contain font information within themselves, so surely this should work without having the actual font installed in the system.