http://sflphone.org/download/source-code The modifications happen frequently enough (and the releases seldom enough) to justify this in my opinion. Most of the traffic on the mailing list concerns the repository (not the stable release).
This package is maintainer-needed and this would need a dedicated maintainer to keep the 9999 ebuild ready for any change upstream could commit there
*** Bug 485762 has been marked as a duplicate of this bug. ***