[SR-Users] Cannot hear voice with symmetric NAT and STUN

[Khoa Pham]

@Daniel, how can the SIP proxy determine whether to use rtpproxy or not ?


On Sun, Mar 3, 2013 at 11:58 PM, Daniel-Constantin Mierla <miconda at gmail.com
> wrote:

>  Hello,
>
> stun works pretty well for non-symmetric nat. If there is symmetric nat,
> then you need a rtp relay (e.g., rtpproxy) or turn server.
>
> Cheers,
> Daniel
>
>
> On 2/28/13 5:48 PM, Khoa Pham wrote:
>
> Hi David, I already read all of these. But the problem seems contradict
> with what I read
>
>
> On Thu, Feb 28, 2013 at 9:56 PM, David <kamailio.org at spam.lublink.net>wrote:
>
>>  Hello,
>>
>> Look on Wikipedia and read the articles for SIP, RTP, NAT and STUN.
>>
>> The answer to your question can be found in the above articles.
>>
>> David
>>
>>
>> On 13-02-27 10:26 PM, Khoa Pham wrote:
>>
>>  Hi, I have Kamailio as SIP server and RTP server. Client is PJSIP.
>>
>>  I read that STUN is for non-symmetric NAT, and RTP server is for
>> symmetric NAT.
>>
>>  Supposed A calls B.
>>
>>  If A, B both use symmetric NAT and STUN, they cannot hear each other
>>  If A or B use non-symmetric NAT and NOT using STUN, they cannot hear
>> each other.
>>
>>  Why is that?
>>
>>  I read
>> http://tools.ietf.org/id/draft-takeda-symmetric-nat-traversal-00.txt for Prediction
>> Failure, is that related to this problem ?
>>
>>  --
>> Khoa Pham
>> HCMC University of Science
>> Faculty of Information Technology
>>
>>
>>  _______________________________________________
>> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing listsr-users at lists.sip-router.orghttp://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
>>
>>
>>
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>>
>
>
>  --
> Khoa Pham
> HCMC University of Science
> Faculty of Information Technology
>
>
> _______________________________________________
> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing listsr-users at lists.sip-router.orghttp://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
>
>
> --
> 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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