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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