Integrating SIP Trunks in Enterprise Networks for Next-Generation Unified Communications
By Cisco Systems
This white paper provides a framework to guide business and IT leaders toward a pervasive unified communication migration by connecting UC islands over the wide area via SIP trunks. Most enterprise UC networks are islands relative to other such enterprise networks, interconnected by the public switched telephone network (PSTN) using older time-division multiplexing (TDM) trunking technology. The PSTN is used for all extra-enterprise or extra-campus communication with other businesses and, in some cases, even with remote branches within the enterprise itself. This imposes limitations on intra- and inter-business communications due to the inherent limitations of TDM technology. As service provider SIP offerings increase, an organization can gracefully migrate services from TDM trunks to Unified Communications trunks as needed, minimizing risk.
