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

[Jiri Kuthan]

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/