Presence and IntComm WG

[Candace Holman <>]

Thanks Jiri - yes, now I'm hooked on that noisy feedback :).  Does your 
post mean that we should be able to configure SER to handle this problem on 
its own?

Candace

At 04:50 PM 4/8/2004, Jiri Kuthan wrote:
> At 09:49 PM 4/8/2004, Candace Holman wrote:
> >I got this error when I tried to IM to Joe.  I note in noisy feedback 
> that the out_uri has a private address.
>
> (now you see what this "noisy feedback" is good for ;))
>
>
> That most likely means that the server is not configured to handle natted
> client. With a nat-ready configuration, SER replaces original SIP contacts
> with transport address of SIP client. A related SER script fragment is
> attached. Note that for complete VoIP NAT traversal, media traversal is
> the harder part and it takes an RTP relay too, resulting in fairly more
> complex configuration.
>
> -jiri
>
>
>     if (nat_uac_test("3")) {
>         append_to_reply("P-Behind-NAT: Yes\r\n");
>         if (method == "REGISTER" || ! search("^Record-Route:")) {
>             log("LOG: Someone trying to register from private IP, 
> rewriting\n");
>             # This will work only for user agents that support symmetric
>             # communication. We tested quite many of them and majority is
>             # smart smart enough to be symmetric. In some phones, like
>             # it takes a configuration option. With Cisco 7960, it is
>             # called NAT_Enable=Yes, with kphone it is called
>             # "symmetric media" and "symmetric signaling". (The latter
>             # not part of public released yet.)
>             fix_nated_contact(); # Rewrite contact with source IP of 
> signalling
>             force_rport();       # Add rport parameter to topmost Via
>             setflag(6); # Mark as NATed
>     };