[Devel] Nathelper enhancement

[Tavis P]

I've encountered this same problem, however the only solution ( that i
could come up with at least ) was to force the use of mediaproxy.

If the client is using STUN i do not believe there is a way to determine
what their internal IP address is


Here is an example of what i'm doing from one of my scripts:
----
# If the IP address of the Callee matches that of the Caller than force
mediaproxy
# This is a workaround for the problem with hair-pinning NAT when using STUN
# If either side is behind NAT than we can just skip the checks
if ( !(isflagset(2) or isflagset(3)) )
{
# Store the destination IP into an AVP
avp_printf("i:450", "$dd");

if ( avp_check("i:450", "eq/$src_ip/g") )
{
log(1, "Forcing Mediaproxy Use Due to Possible Lack of NAT Hairpinning
Support");

# Mark Session to Use Mediaproxy
setflag(3);
}
}
----


S G wrote:
> Sure. An example would be when there are 2 stun enabled clients
> calling from behind the same NAT. They both have the same external IP
> assigned in the SDP due to STUN. Usually most NAT's dont allow hairpin
> of media so the call fails. I'd like to take the local ip from the O
> line or from the DB and load it in an AVP then rewrite the C line with
> the local IP.
>
> Thanks,
> Sumeet
>
>
>> From: Bogdan-Andrei Iancu <bogdan at voice-system.ro>
>> To: S G <skg1010 at hotmail.com>
>> CC: devel at openser.org
>> Subject: Re: [Devel] Nathelper enhancement
>> Date: Tue, 28 Feb 2006 11:28:12 +0200
>>
>> HI Summet,
>>
>> basically it can be done, but can you provide a real-case example of
>> using this feature?
>>
>> regards,
>> Bogdan
>>
>> S G wrote:
>>
>>> Hi,
>>>
>>> This is a request for a nathelper enhancement. Can Nathelper be
>>> enhanced to insert any user provided IP in the SDP C line through an
>>> AVP? Currently fix_nated_sdp() can only rewirite with the source IP
>>> of the message.
>>>
>>> Thanks,
>>> Sumeet
>>>
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>>
>
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