[OpenSIPS-Users] NAT per call leg

[Daniel Goepp]

I'm going to look the complete fool here for my lack of understanding how
OpenSIPS would handle this via it's route branching, but I am just banging
my head on this one.  Here is the problem:

For simplification I'm using the first octet of the IP to identify the
system, and the connect line of the SDP for both INVITE and OK

How we have it setup today:
OpenSIPS B doesn't see the call as NATd which it isn't between proxies so
sends sdp w/204 to UAC B.
UAC A (192) -> INVITE (192) -> OpenSIPS A (204) -> INVITE (204) -> OpenSIPS
B (76) -> INVITE (204) -> UAC B (192)
UAC A (192) <- OK (204) <- OpenSIPS A (204) <- OK (192) <- OpenSIPS B (76)
<- OK (192) <- UAC B (192)

What we would like it to do:
Split the handling of NAT, so the sdp on the call leg between proxies is not
touched, but the call leg to the UAC B is rewritten for NAT, and the SDP in
the OK back to Proxy A is rewritten.
UAC A (192) -> INVITE (192) -> OpenSIPS A (204) -> INVITE (204) -> OpenSIPS
B (76) -> INVITE (76) -> UAC B (192)
UAC A (192) <- OK (204) <- OpenSIPS A (204) <- OK (76) <- OpenSIPS B (76) <-
OK (192) <- UAC B (192)

Does this make sense.  I'm trying to dig through the archives to see if
there is something on this, but I'm not finding much yet.

Any help is MUCH appreciated....I know, it's Xmas even, and I'm messing
around with OpenSIPS...what a life ;)

-dg
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