[SR-Users] When to rewrite o= in SDP ?

[Khoa Pham]

@Daniel

Thanks for reply. But do you know what affects Kamailio in deciding whether
to rewrite c= or not ?


On Sun, Mar 3, 2013 at 11:42 PM, Daniel-Constantin Mierla <miconda at gmail.com
> wrote:

>  Hello,
>
> for nat trversal, I suggest you use the default kamailio.cfg from later
> versions 3.3.x or upcoming 4.0. Read the comments at the top of the file --
> practically the routing logic for nat traversal is surrounded by WITH_NAT
> define.
>
> o= line is not used for rtp relaying, but some clients expect to be the
> same as c=, at that moment it should be rewritten (or better rewrite it
> always to be sure that is not the reason of some no-audio problem).
>
> Cheers,
> Daniel
>
>
> On 3/1/13 12:47 PM, Khoa Pham wrote:
>
> Hi, I mistype. What I want to know is what affects Kamailio decision in
> rewriting c= in SDP.
>
>  In http://kamailio.org/docs/ser-getting-started/SER-GettingStarted.pdf,
> I see that
>
>   if (isflagset(6)) {
>  force_rport();
>  fix_nated_contact();
>  force_rtp_proxy();
>  }
>
>  Which means that Kamalio only cares if the caller is behind NAT or not.
>
>  Does it care about caller's symmetric NAT, using STUN, callee's nat type
> ?
>
>
> On Fri, Mar 1, 2013 at 10:38 AM, Khoa Pham <onmyway133 at gmail.com> wrote:
>
>> Hi, I read in http://kamailio.org/docs/modules/1.4.x/nathelper.html that
>> Kamailio might rewrite ip address in o= in SDP to facilitate NAT
>> traversal.
>>
>>  It may decide to use to original IP or use IP of RTP server. What
>> factors affect its decision ?
>>
>>  --
>> Khoa Pham
>> HCMC University of Science
>> Faculty of Information Technology
>>
>
>
>
>  --
> Khoa Pham
> HCMC University of Science
> Faculty of Information Technology
>
>
> _______________________________________________
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>
>
> --
> Daniel-Constantin Mierla - http://www.asipto.comhttp://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
> Kamailio World Conference, April 16-17, 2013, Berlin
>  - http://conference.kamailio.com -
>
>
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>
>


-- 
Khoa Pham
HCMC University of Science
Faculty of Information Technology
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