[Bayonne-devel] Bayonne, Broadvoice, and other undocumented SIP things

[David Sugar]

There has been a lot of interesting work in Bayonne recently for
implementing phonesystem-like features and functionality, particularly
in the SIP driver.  None of it has been documented to date.

This is an interesting area of development, and one where Bayonne has
certain unique characteristics.  One of them is that we fast proxy rtp
call connections, which has much lower latency than transcoding.  Since
we establish the call session at the time of server connect, this
imposes some limitations in SDP negotiation since we may later join the
call to another device.  I have thought of moving the server connection
to the join state and to allow SDP to be proxied directly between the
endpoints rather than negotiated by bayonne.  This would also allow for
pure peer calling (where no voice goes through bayonne), perhaps when on
the same network.  This is something that may get added in the future.

I was thinking of starting a new Faq on the wiki related to specific
admin/configuration/uses of Bayonne for phone systems.  I think if I do
a new FAQ, it should explain and offer example of things like, for
example, how to configure and use a service provider, like for example
broadvoice, for SIP trunking, or how to trunk over SIP with an Asterisk
server.  It should also explain how we do anonymous calling to allow one
to receive calls through public uri's.  It probably should also explain
how we handle public sdp's and port-forwarding behind NAT, taking
advantage of the fact Bayonne allocates RTP sockets in a block of ports.