[Serusers] HELP me: Confuse between mediaproxy and STUN

Marian Dumitru marian.dumitru at voice-sistem.ro
Tue Mar 22 20:08:16 CET 2005


Hi Charles,

It's correct, if _all_ clients use STUN (and a correct implementation) 
you don't need mediaproxy or nathelper.

Best regards,
Marian

Charles Wang wrote:
> Marian,
> 
> Thank you very much for your explain. 
> So, if a client side with STUN support and setting it correctly, is it
> not necessary
>  to use media proxy(outboumd proxy setting)? If yes, my clients with
> STUN should
> can talk to each other without setting outbound proxy. 
> 
> But in fact, I test this with two X-Pro running on two NATed PCs. I
> find out they are always send its RTP to my SER not send to each other
> directly. So it will add my SER's loading. Can you tell me how to
> change my ser.cfg to avoid such condiction? Please....
> 
> 
> 
> 
> 
> On Tue, 22 Mar 2005 19:26:35 +0100, Marian Dumitru
> <marian.dumitru at voice-sistem.ro> wrote:
> 
>>Hello Charles,
>>
>>Just to give you the big picture about NAT traversal mechanisms:
>>
>>STUN is used to perform the NAT traversal on the client side - the UAC
>>is NAT aware (via STUN) and sends SIP messages using the public IP. From
>> server side, the UAC will look like a public one, so there no logic
>>required on server for this case.
>>
>>nathelper and mediaproxy are rather equivalent and implement NAT
>>traversal on server side - UAC has nothing to know about NAT and send
>>messages with private IP. The server takes care about detecting a
>>correcting messages coming from behind a NAT.
>>
>>Best regards
>>Marian
>>
>>Charles Wang wrote:
>>
>>>Hi, ALL:
>>>
>>>I can't not make sure my view point between STUN and mediaproxy.
>>>Please explain for me.
>>>In my view, if NATed UACs want to make a call,
>>>the solutions shall be nathelper, mediaproxy or building a STUN server.
>>>
>>>If NATed UACs set their own STUN server's IP correctly,
>>>and they want to talk with each other will be in a "direct"
>>>(RTP will not pass through SER) mode, is it correct? And the STUN server
>>>will tell our UACs what's their NAT gateway's IP(behind what kind
>>>of network environment , and UACs will send these informations to SER?
>>>In another word, it is not necessary to use media proxy to pass their
>>>RTP channel?
>>>
>>>If it is correctly, so we will not to set any mediaproxy daemon for
>>>them, is it correct?
>>>If it is not, can anyone tell me why it is not?
>>>
>>>If ignore the STUN issue, I use the mediaproxy's ser.cfg as my template ser.cfg.
>>>But I find all UACs's RTP packages will pass through my SER wether
>>>behind NAT or not( read IPs ). How can I modify my ser.cfg and make a
>>>call directly without pass through SER if two UACs are all real IPs?
>>
>>--
>>Voice System
>>http://www.voice-system.ro
>>
> 
> 
> 

-- 
Voice System
http://www.voice-system.ro




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