Wspólnotowy Serwis Informacyjny Badan i Rozwoju - CORDIS

Provision of a multi-component SIP infrastructure for heterogeneous IPv4 / IPv6 environments

To facilitate the introduction of VoIP services in IPv6 networks, the Fraunhofer Institute Fokus has developed and tested a complete VoIP infrastructure that not only provides services with a comparable quality to the current commercial VoIP services in the IPv4 world but also supports VoIP communication between IPv4- and IPv6 networks. In the context of the 6NET project, FhI Fokus has been working at providing a technical solution that not only enables VoIP services in IPv6 networks but also in heterogeneous environments comprised of IPv4- and IPv6 networks. To provide a VoIP solution for heterogeneous IPv4/IPv6 environments a SIP-based VoIP infrastructure was developed consisting of: (1) VoIP signalling infrastructure: Establishing a VoIP session involves the exchange of signalling messages as well as the authentication and registration of users. A platform widely used in the Internet by various commercial ISPs and ASPs is an open-source project under the name of the SIP Express Router (SER) which is well known for its flexibility and robustness. To support VoIP communication in IPv6 networks, SER was extended to support IPv6 as well. (2) VoIP soft agents: To enable a user to actually start a VoIP call, he can either user a dedicated IP-based phone or a software tool running on a PC. To enable IPv6 communication, in the 6NET project an open-source VoIPv6 tool called BonePhone was developed, and another one, already existing for IPv4 (KPhone developed by the Wirlab Network research center, Finland), was extended to support IPv6. (3) Translation mechanisms: In order to enable communication between IPv4- and IPv6 users, some means of translating SIP messages between the two worlds is needed. For this reason, a translating gateway was developed which translates SIP messages so as to allow IP4- or IPv6 SIP devices to communicate with each other without requiring any additional intelligence, and translates the media traffic (RTP) between IPv4- and IPv6 networks. To achieve a wide public exposure, the popular VoIP site was made also IPv6 capable. As a public presentation platform, allows IPv6 users to access a VoIP server, request a VoIP identity and use a number of services such as call logs, voicemail and the such. Using the allocated VoIP addresses, users can utilize the VoIP service from their IPv6 networks.

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