The SIP-PBX is a new category of product for enterprise-wide communications and communications-intensive applications.

It combines:
the locally-delivered services of the PBX
the IP networking features and distributed architecture of the IP-PBX
the trunk management (trunks interconnect two or more voice devices over the wide area network) power of the carrier softswitch
The SIP-PBX uses advanced protocols such as Session Initiation Protocol (SIP) to enable a new framework for advanced enterprise-wide productivity enhancing and customer interaction applications.

The SIP-PBX can be deployed in a variety of customer scenarios. The telephony networks of most major enterprises use a host of vendor equipment that has delivered digital voice services over the years. These companies are in no position to throw out all their capital equipment. Furthermore, each of these services such as voice mail, call center, and other offerings involve adjunct servers, attached to the PBX fabric through proprietary line side ports or data interfaces. These applications do interoperate through standards, but at great cost.

The vast majority of PBXs are network islands connected via traffic-bearing circuits.

The SIP-PBX can work with legacy PBX implementations to bring these islands together, participate fully in forklift upgrades of already depreciated telephony infrastructure, and act as an overlay application to unify control of the VoIP network backbone. Furthermore, the SIP-PBX enables powerful services such as centralized voice mail for inexpensive storage, backup and regulatory compliance, corporate-wide directory for stronger customer service, global follow-me services for more productive employees, and many other applications that will drive successful penetration of this new technology.