I have a multi-homed kam with a uas behind one private interface and a
public interface for the uac+sip provider.
When the uac initiates a call, kam sends the invite to the private uas
which sets up a b-leg call back to kam with a Contact header that has the
uas' private ip address. I want to change that private ip address to be
Kamailio's advertised/public ip address before it gets forwarded to the sip
provider.
I am rewriting Contact in a route from request_route like this:
> if ($rP != $null) {
> $var(ct) = ";transport=" + $rP;
> }else{
> $var(ct) = "";
> }
> $var(cr) = "<sip:" + $fU + "@" + $RAi + ":" + $RAp + $var(ct) + ">";
>
> remove_hf("Contact");
> append_hf("Contact: $var(cr)\r\n");
This seems to work fine for the INVITE going to the provider.
There's also the 200 OK that the uas sends for the uac (a-leg) with a
private ip address in Contact -- I want to rewrite that before sending it
to the UAC, too.
Using the same method as above (but inside onreply_route), what happens is
the UAC receives the modified OK and sends back an ACK with the modified
Contact (kam's public ip addr) in the ACK r-uri, and kam gets in a loop of
sending an ACK from its private ip address to its public ip address and
replying to itself.
call flows: https://imgur.com/a/Yj2DJpn
Is there a right way to do this?
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