[Serusers] SER + rtpproxy

[Soren (Home)]

Hi Grzeogorz,

It will be a good idea to read up the Network-variations chapter in the
RFC for STUN, it gives a quite good overview of when STUN can help and
when it cannot: http://www.faqs.org/rfcs/rfc3489.html

I've yet to find a working solution with SER that doesnt require me to
take proxy RTP for all calls, so some advice from the gurus on how to do
this would be nice.

Cheers, Soren

> I found on:
> www.informatik.uni-bremen.de/~prelle/terena/cookbook/main/ch04s07.html
>
> ----->:
> When both parties are behind two different NATs, then this approach will
> not work. The reason is very simple, since both SIP user agents are behind
> NAT, both of them need to send the first media packet to open pinholes in
> NAT. Both of them will use the data received in SDP, but that will not
> work because NATs might have changed the port number.
>
> To solve the situation, an intermediary in the public internet will be
> necessary -- an RTP proxy. The RTP proxy will receive all the media
> traffic from both parties and send it to the other side. Because it will
> be located in the public internet it can wait for the first media packet
> from both sides and send subsequent media packets to IPs and port from
> which it received the first packets.
> -----<
> I've tried with the stun server and without rtpproxy. The SIP signaling
> was working properly but there was not voice communication between UAs.
> Grzegorz
>
> <"Neill Wilkinson" wrote>
>> You could use a STUN server instead.
>> Neill....:o)
>> -----Original Message-----
>> From: serusers-bounces at iptel.org [mailto:serusers-bounces at lists.iptel.org]On
> Behalf Of
>> Grzegorz Kowalczyk
>> Sent: Tuesday, September 28, 2004 1:20 PM
>> To: serusers at lists.iptel.org
>> Subject: [Serusers] SER + rtpproxy
>> Hi!
>> Do I have to use rtpproxy to communicate two NAT-ed UA's?
>> Is there any alternative way to do this?
>> How many simultaneous rtpproxy sessions may serve the one ordinary PC?
> Grzegorz
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>
>
>
>
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-- 
Soren Davidsen,
Univ: AUE department of computer science, room H302, +45-20676081
Home: http://tanesha.net/, +45-36947805 or +1-3602266324
Ring billigt med IP-telefoni: http://musimi.dk/, http://GratisSip.dk/