This paper is the first in a series of white papers that will introduce and explore several mature, open sourceVoIP technologies that may not be well known, but are worthy of serious consideration. Over the course ofthe series, we will explore how organizations can take advantage of these emergent, reliable, and scalabletechnologies. This paper will focus on Sangoma’s recently introduced A500 BRI card, and by doing sointroduce Sangoma SMG, the Sangoma Signalling and Media Gateway.