This strategic analysis is part of Frost & Sullivan’s continued coverage of the North American enterprise telephony marketplace, with special focus on open-source IP telephony. For the purposes of this research, the telephony market comprises telephony systems or private branch exchanges (PBXs) built on open-source software and capable of supporting both IP and analog endpoints. The research also provides insight into the ecosystem needed to support the open-source telephony initiative. The study highlights key technology and market trends that are impacting the open-source telephony market. It provides profiles of selected market participants and an analysis of the competitive landscape.