[SR-Users] maddr parameter in contact header and fix_nated_contact

[Morten Isaksen]

Hi Daniel,

Thanks for a very quick response. The patch seems to work fine on
3.2.2. I will do some more testing later today.

/Morten

On Fri, Jun 1, 2012 at 11:37 AM, Daniel-Constantin Mierla
<miconda at gmail.com> wrote:
> Hello,
>
> I committed a patch to remove maddr in fix_nated_contact() as it makes no
> sense anymore if contact uri is updated:
>
> http://git.sip-router.org/cgi-bin/gitweb.cgi/sip-router/?a=commit;h=c3caaa4c12f76c77381c6a0afc8688bc38b16999
>
> If you can give it a try and all goes ok, then I will backport.
>
> Cheers,
> Daniel
>
>
> On 6/1/12 9:45 AM, Morten Isaksen wrote:
>>
>> Hi Again,
>>
>> For some reason my e-mail got truncated. Here is the complete e-mail:
>>
>> I have this setup:
>>
>> Mediation server with internal ip -- NAT firewall -- Kamailio proxy --
>> PSTN gateway
>>
>> The mediation server sends a contact header with maddr=<internal IP>
>>
>> fix_nated_contact only changes the host part and leaves the maddr intact.
>>
>> When the PSTN gateway sends a PRACK or a BYE it puts the <internal IP>
>> in the RURI, and kamailio then try to forward the message directly to
>> the <internal IP> and not the NAT ip.
>>
>>  From RFC 3261 19.1.1:
>>
>> The maddr parameter indicates the server address to be
>> contacted for this user, overriding any address derived from
>> the host field.  When an maddr parameter is present, the port
>> and transport components of the URI apply to the address
>> indicated in the maddr parameter value.  [4] describes the
>> proper interpretation of the transport, maddr, and hostport in
>> order to obtain the destination address, port, and transport
>> for sending a request.
>>
>> I can see that OpenSIPS has fixed this.
>>
>> http://sourceforge.net/tracker/?func=detail&atid=1086410&aid=3312423&group_id=232389
>>
>> Would it be possible to get this patch into Kamailio also?
>>
>> /Morten
>>
>>
>>
>> On Fri, Jun 1, 2012 at 8:57 AM, Morten Isaksen <misak at misak.dk> wrote:
>>>
>>> Hi,
>>>
>>> I have this setup:
>>>
>>> Mediation server with internal ip -- NAT firewall -- Kamailio proxy --
>>> PSTN gateway
>>>
>>> The mediation server sends a contact header with maddr=<internal IP>
>>>
>>> fix_nated_contact only changes the host part and leaves the maddr intact.
>>>
>>> When the PSTN gateway sends a PRACK or a BYE it puts the <internal IP>
>>> in the RURI, and kamailio then try to forward the message directly to
>>> the <internal IP> and not the NAT ip.
>>>
>>>
>>>  From RFC 3261 19.1.1:
>>>
>>>         The maddr parameter indicates the server address to be
>>>         contacted for this user, overriding any address derived from
>>>         the host field.  When an maddr parameter is present, the port
>>>         and transport components of the URI apply to the address
>>>         indicated in the maddr parameter value.  [4] describes the
>>>         proper interpretation of the transport, maddr, and hostport in
>>>         order to obtain the destination address, port, and transport
>>>         for sending a request.
>>>
>>>
>>> I can see that OpenSIPS has fixed this.
>>>
>>> http://sourceforge.net/tracker/?func=detail&atid=1086410&aid=3312423&group_id=232389
>>>
>>> Would it be possible to get this patch into Kamailio also?
>>>
>>> --
>>> Morten Isaksen
>>
>>
>>
>
> --
> Daniel-Constantin Mierla - http://www.asipto.com
> http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
> Kamailio Advanced Training, Seattle, USA, Sep 23-26, 2012 -
> http://asipto.com/u/katu
> Kamailio Practical Workshop, Netherlands, Sep 10-12, 2012 -
> http://asipto.com/u/kpw
>
>
>
>
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-- 
Morten Isaksen