[Users] Re: [Serusers] Prevent bandwidth lost

Klaus Darilion klaus.mailinglists at pernau.at
Mon Nov 28 11:12:47 CET 2005

This scenario was handled on the mailing list before. Please search the 

The problem, this does not work always as there may be multiple NATs 
where the clients are not in the same subnet although they have the same 
public IP.

AFAIK the only solution to handle this without relaying over an RTP 
proxy is the usage of ICE capable clients.


Christophe Irles wrote:
> Hi,
> I'm wondering how to prevent bandwitdh lost with (open)SER+MediaProxy in
> this type of network configuration:
> UA0 --- [(open)SER+MediaProxy] --- [ Internet ] --- [ FW/NAT ] --- [UA1,
> UA2]
> UA1, UA2 are one the same network and they are registered in the (open)SER
> server.
> If UA1 call UA2 with default media proxy configuration, the RTP flow will
> not be direct between this two UA. So I lost twice bandwith (from SER to UA1
> and SER to UA2).
> How can i prevent this ? On the REGISTRAR process, I think I could store the
> public IP used by UA1 and UA2 and the two private IP of this UA. Since they
> have the same public IP but a different private IP, on the INVITE procces I
> suppose it's could be possible to indicate that RTP flow can be direct
> between this two devices, no ? Now which tools (modules) could be used to
> resolve this ?
> Thanks,
> Christophe
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> Serusers at iptel.org
> http://mail.iptel.org/mailman/listinfo/serusers

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