[Serusers] How to force IPtel.org SIP proxy not to include RTP proxy in Media path (achive peer-to-peer flow)

[girish kumar]

Yes, my main concern is regarding the Latency
introduced due to round-trip media flow from Intranet
to RTP proxy of IPtel.

In my current setup, this latency is getting
unnecessarily introduced. Is there any way to avoid
it?

--- Jiri Kuthan <jiri at iptel.org> wrote:

> At 08:12 04/03/2008, girish kumar wrote:
> >Hi,
> >
> >I have 2 SIP based softphones (Xlite) registered on
> >IPtel.org SIP service and testing the calls among
> >them. These 2 softphones are behind different NAT
> and
> >IPtel.org SIP proxy is replacing the SDP connection
> >details in Call setup message (Invite and 200 OK)
> with
> >RTPproxy IP/ports. Hence, RTPproxy is relaying the
> >Voice media stream among them during the call.
> >
> >Although, both the softphones are behind different
> NAT
> >address but these are not Symmetric NATs and hence
> RTP
> >can directly flow between these softphone using
> STUN
> >discovery.
> 
> That's what I'm not sure about. If they were using
> STUN,
> iptelorg:5060 should not have detected them as
> natted.
> Any insight in this?
> 
> 
> >Is it possible to disable the RTP proxy behaviour
> of
> >IPtel.org SER server for these 2 softphones through
> >some configuration changes or any special header
> >parameter in call setup message? 
> >
> >In User Management web interface of IPtel.org,
> there
> >is a option to specify the connectivity realm for a
> >user account under My Account -> Other tab.
> >
> >The description of this field is "connectivity
> realm -
> >behind the same NAT or possibility to communicate
> >directly". I believe this field is playing some
> part
> >in NAT transversal mechanism of Iptel.org SER
> >implementation.
> 
> I think too that was thought so, but I think it is 
> unused at the moment.
> 
> 
> >Can anyone please describe the significance of this
> >user account parameter? Can it be used to disable
> NAT
> >transversal of media stream for some individual
> >clients? I tried putting in same value of this
> field
> >for 2 user accounts but Iptel.org SIP server still
> >proxied media stream between these 2 user accounts
> >through its RTP proxy.
> 
> Do you experience any other troubles than latency or
> would you just like
> to cut the proxy out of the path?
> 
> -jiri
> 
> 
> >Thanks in advance.
> >Girish
> >
> >
> >
> >
> >     
>
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> 
> 
> 
> --
> Jiri Kuthan            http://iptel.org/~jiri/
> 
> 



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