When configuring a PBX, it is very important to configure any device capable of connecting our system to the public switched telephone network (PSTN). Elastix is so flexible that we don't need to use a specific brand of telephonic cards. There are so many brands such as Digium, Sangoma Open Vox, Synway, and Khomp (just to name a few) that can be used to connect our server to the PSTN. For a complete list of certified hardware and configuration guides that work perfectly with Elastix, we can visit http://elastix.org/index.php/en/product-information/certified-hardware.html.
In this chapter, we will cover the specific examples of the Sangoma analog card and the Sangoma digital E1 card.