[Serusers] What's the best solutions ? RTP Proxy or STUN Server ?

[Jiri Kuthan]

At 10:48 PM 12/2/2003, Olle E. Johansson wrote:
>Jiri Kuthan wrote:
>
>>at best both, STUN does not help with all kinds of NATs. Use STUN
>>if you can, RTP proxy otherwise. -jiri
>
>You can't choose between the fruit basket and an apple...

I'm not good in agronomy so I can't compete in statements about fruits,
apples and other healthy food.

However as for NATs, the strategy "use STUN by default, rtp relay as last resort"
works pretty well. STUN actually does the magic to let your calls through
for many NATs. 

-jiri


>STUN checks the NAT situation from a client point of view. STUN does not
>do magic to let your calls through, it gives the UA an idea on how the
>world looks and then the UA makes the choice on how to get traffic going
>or give up and eat up all the fruits in the basket.
>
>If you have problems with your NAT, the RTP proxy might be part of the solution to
>get calls going in combination with SER module Nathelper. The whole idea is
>to take care of the media stream when the two SIP clients can't handle the
>media stream across the NAT's. Yes, it shouldn't be necessary.
>
>Other solutions involve symmetric RTP, see
>http://www.voip-info.org/wiki-RTP+Symmetric
>
>
>More info on STUN:
>http://www.voip-info.org/tiki-index.php?page=Stun
>
>Vovida.org have an Open Source STUN server.
>Pointer here:
>http://www.voip-info.org/tiki-index.php?page=Open%20Source%20Voip%20software
>
>Disclaimer: This is a messy area. I could be all wrong... :-)
>
>/Olle

--
Jiri Kuthan            http://iptel.org/~jiri/