[Serusers] NAT contat rewrite

[Jiri Kuthan]

Contacts are used to advertised wherebouts for subsequent in-dialog
requests coming back to your UAC. For that reason, I don't entirely
understand why the UAC includes Contact in CANCEL at all -- all in all
CANCEL is used to discontinued estabslishment of a dialog. Anyhow, 
it should not matter the Contact content is invalid since there is no 
use for the header field in this case at all.

-jiri

At 11:16 AM 7/18/2004, Linus Surguy wrote:
>Hi all,
>
>I'm sure I must be doing something very stupid! I'm using fix_nated_contact
>and then t_relay(). The INVITE is being sent with a rewriten contact field,
>but if the UA issues a CANCEL the private IP address is sent in the contact
>field and is not rewritten.
>
>What basic mistake have I made?!
>
>A cut down version of my ser.cfg is:
>
>        record_route();
>        # loose-route processing
>        if (loose_route()) {
>                t_relay();
>                break;
>        };
>
>
>        fix_nated_contact();
>
>        force_rport();
>
>        if (method=="INVITE") {
>               fix_nated_sdp("1");
>               force_rtp_proxy();
>                /* set up reply processing */
>                t_on_reply("1");
>                setflag(6);
>
>       };
>
>        rewritehostport("213.xxx.xxx.xxx:5060");
>
>        if (!t_relay()) {
>                sl_reply_error();
>        };
>
>
>
>  # all incoming replies for t_onrepli-ed transactions enter here
>
>onreply_route[1] {
>
>        fix_nated_contact();
>
>       if (status=~"[12][0-9][0-9]")
>                force_rtp_proxy();
>}
>
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--
Jiri Kuthan            http://iptel.org/~jiri/