SIPfoundry is organized around projects. A project is defined as a major distinct development effort.

Major projects include:

• SIPX - sipX is composed of an extensive portfolio of SIP based products (pbx, softphone, and supporting component products)
• reSIProcate - reSIProcate is a comprehensive SIP protocol stack for use in SIP applications
• OSPclient - The OSPclient Toolkit is a development kit to implement the client side of the ETSI Open Settlement Protocol (OSP). OSP is a protocol that is well suited for managing SIP transaction inter-domain routing, access control and accounting.
• SFTF - The SIP Forum Test Framework (SFTF) allows SIP vendors to test their devices for common errors and improve their device interoperability.