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

[Khoa Pham]

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
>
>
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>
>
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>


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