Savoir-faire Linux has been doing it with Ring (https://ring.cx https://ring.cx) (initially sflphone) since 2004. It turns out that the skills that the company

Savoir-faire Linux has been doing it with Ring (https://ring.cx https://ring.cx) (initially sflphone) since 2004. It turns out that the skills that the company has acquired by doing this pays back with consulting contracts.