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[reSIProcate] RFC3725 SIP 3pcc with DUM


Hi:
I'm trying to implement the Controller described in this RFC using DUM, but I've had just partial success after a few days of hard work. My first question should be: Is it DUM the right framework to do this ? Does anyone know some code example, besides the incomplete /dum/test/test3pcc.cxx ? (I said incomplete because it only calls ONE peer, wich is pretty easy, but it tells nothing about connecting A & B parties, like the RFC scenarios).

I've managed to make "Flow I" work (Figure 1, in RFC's page 4).
But I don't understand some of the instructions at "Flow IV" (RFC's page 9). When it comes to manipulate: offer2 -> offer2' and answer2' -> answer2, I miss the point :-(
Does any one know which changes should I do to the SdpContents objects I've got 
from offer2 and answer2' ?
Is there any example source code doing this with DUM ?
Thanks in advance !
Diego