The Fraunhofer FOKUS Institute is one of the leading authorities in IMS, NGN, SOA and SDP components and architectures. Their Open Source IMS Core is based on the SIP Express Router (SER) and is developed according to 3GPP, 3GPP2, ETSI TISPAN and PacketCable standards.

Download the latest version via Subversion. An Installation guide for linux is also available.

OpenBloX is a Open Source Diameter framework adapted to the needs of Telco Next Generation Networks and IMS architecture. OpenBloX includes the Diameter base protocol (RFC 3588) and all 3GPP & 3GPP2 interfaces.

The Communications Research Group at the University of Cape Town have released an implementation of a Policy Decision Function (PDF) and a Policy Enforcement Point (PEP) for the OSIMS. These elements together with extensions of the P-CSCF (from FOKUS) create a very useful tool for QoS and Policy Control research. This tool can be tested using the latest version of the UCTIMSClient by setting the QoS field in the profile menu to Manadory.

Comprehensive download, installation and testing instructions can be found here.

This Open Source application implements the HSS network element within an IMS Core Network (CN).

Description of implementation:

• This project implements the (IMS) database schema described in 23.008 Subscriber Data, the procedures in 29.228 Signaling and the algorithms in 35.206 MILENAGE. It is based upon Release 7.
• The system was developed entirely in Erlang/OTP using the Mnesia distributed database application. The procedures are executed in mnesia transaction contexts and many servers may be run on many nodes for a very high capacity system. The MILENAGE algorithms utilize the crypto application.
• A number of test suites are included which use the common_test application. All of the conformance test data in 35.208 is included in one test suite. The xmerl application is used in test cases to validate the XML user profile downloaded during registration.

This Open Source project is hosted by GoogleCode and can be downloaded via subversion