[SR-Users] RTPproxy in bridge mode question

[Uriel Rozenbaum]

Guys,

I'm successfully using a Kamailio + RTPproxy setup in bridge mode with most
of my Gateways. My setup includes two different interfaces one with a public
IP and teh other with the private IP.

Now I'm facing some slight issue. Some providers won't accept my calls (or
calls will have some strange behavior) if the Contact header has an IP out
of immediate range.

I tried to use fix_nated_contact() function but as per my topology, this
function will not change the contact header because the IP is already the
one on the interface.

Example:
U 192.168.200.X:5060 -> 192.168.200.Y:5060
INVITE sip:111160911097 at 192.168.200.Y SIP/2.0.
Via: SIP/2.0/UDP 192.168.200.X:5060;branch=z9hG4bK096baacc;rport.
From: "Uriel Rozenbaum" <sip:60911100 at 192.168.200.X>;tag=as32794d5e.
To: <sip:111160911097 at 192.168.200.Y>.
Contact: <sip:60911100@*192.168.200.X*>.

U 200.A.A.A:5060 -> 200.B.B.B:5060
INVITE sip:898960911097 at 200.B.B.B SIP/2.0.
Record-Route: <sip:200.A.A.A;r2=on;lr=on;ftag=as32794d5e>.
Record-Route: <sip:192.168.200.Y;r2=on;lr=on;ftag=as32794d5e>.
Via: SIP/2.0/UDP 200.A.A.A;branch=z9hG4bK5222.14fbf4f7.0.
Via: SIP/2.0/UDP
192.168.200.X:5060;received=192.168.200.X;branch=z9hG4bK096baacc;rport=5060.
From: "Uriel Rozenbaum" <sip:60911100 at 192.168.200.X>;tag=as32794d5e.
To: <sip:111160911097 at 192.168.200.Y>.
Contact: <sip:60911100@*192.168.200.X*>.

Is there any way to let know Kamailio the outgoing IP I'll be using and fix
the contact accordingly?
I can trigger this change after I know the destination IP.

Thanks!
Uriel
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