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

[Khoa Pham]

Hi all,

When using STUN, I can detect my NAT type. The SDP contain x-NAT field (0:
unknown, 1: full cone, ..., 6: symmetric) which tells Kamailio the NAT type
of clients. Why doesn't Kamailio use that ?


On Mon, Mar 4, 2013 at 7:11 PM, Mitan Lopez <mitan23 at aol.com> wrote:

> then what would be this bad DSP or RTP packages dropping reason for that
> makes such noises? (for example if I speak louder that train soud gets
> louder or when I speak low the win/train sound gets lower as well)
>
> Mitan Lopez
> mitan23 at aol.com
>
>
> -----Original Message-----
> From: Alex Balashov <abalashov at evaristesys.com>
> To: sr-users <sr-users at lists.sip-router.org>
> Sent: Mon, Mar 4, 2013 3:25 pm
> Subject: Re: [SR-Users] Cannot hear voice with symmetric NAT and STUN
>
>  On 03/04/2013 06:53 AM, Mitan Lopez wrote:
>
> > I understand, but some times 2 UAs have audio one side voice is clear
> >  but in other side voice is just like train sound (or wind sound) is
> > this from NAT too?
>
> No.  NAT does not introduce any acoustic anomalies;  it would simply
> prevent the reachability of audio altogether.  What you describe sounds
> like a bad DSP or gateway similar.
>
> ... unless the handset you are using generates this kind of noise when
> it is not receiving incoming RTP.
>
> -- Alex
>
> --
> Alex Balashov - Principal
> Evariste Systems LLC
> 235 E Ponce de Leon Ave
> Suite 106
> Decatur, GA 30030
> United States
> Tel: +1-678-954-0670
> Web: http://www.evaristesys.com/, http://www.alexbalashov.com/
>
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>
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>


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