Hi,

I am a newbie for netfilter and is planing a SIP enabled module with netfilter,
but some question puzzled me.

10.10.1.2¡ª¡ª159.226.1.1¡ª¡ª159.226.1.2¡ª¡ª10.10.2.2 
A------>B£¨GW:10.10.1.1)-->C(GW:10.10.2.1)-------->D
A(159.226.1.1:10000)
D(159.226.1.2:10000)

There are two NATs,  host A and D are in the NAT.
If A have known the IP address and port of D which had been mapped(159.226.1.2:10000),
can A send RTP packet to D directly?
In other word,if A and D had known the others mapped address,
can A communicate with D directly?
Does  ip_nat_expect_register() founction  in netfilter can fulfil above goal?

Thanks



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