Woomera
The Woomera protocol makes it possible to put your voice over ip system in one server/process and your pbx in another and connect them with a simple raw-linear-over-udp protocol. Woomera provides a socket interface through which GPL software can utilise non-GPL compliant VoIP protocol stacks.A channel driver module "chan_woomera" is available for Asterisk and CallWeaver to interface the PBX with woomera.
Woomera currently only supports H323 but it should soon support the OPAL VOIP abstraction layer which will allow it to speak many other protocols. The number of protocols supported by the Woomera server is irrelevant to chan_woomera which will support anything Woomera supports because of it's thin-client-like design.
With woomera you can connect Asterisk, Freeswitch or CallWeaver to a H.323 server (openh323 code) which will do H.323 over IPv6. Apparently openh323 also has some SIP code in their CVS. If added to chan_woomera, you'd get SIP over IPv6 as well.
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