[Serusers] User ser+nathelper+rtppoxy as outbound server

Richard richard at o-matrix.org
Thu Sep 2 08:52:06 CEST 2004


Hi,

I am looking at the same type of setup too.

A local ser runs on the NAT firewall. A UA behind NAT registers with the
local ser. When a SIP message is sent out to outside world, local ser does
record route. So it is always in the path and there is not need to change
SIP contact field. The only thing which needs mangle is the SDP if calling
the outside world. It should be changed to the local ser's outside ip
address. Rtpproxy, (if it is capable of doing this), can forward the traffic
between inside and outside.

The greatest benefit I can see is that traffic for an intra-office call
never has to go out. It would be easy to maintain a good quality. Also the
phone system is still up even if the outside connection is down. Other
benefits include a distributed registration database.

Any comment?

Richard


-----Original Message-----
From: serusers-bounces at iptel.org [mailto:serusers-bounces at lists.iptel.org] On
Behalf Of Zhou Jiang
Sent: Wednesday, September 01, 2004 5:19 PM
To: serusers at lists.iptel.org
Subject: [Serusers] User ser+nathelper+rtppoxy as outbound server

I want to cofig ser as a outbound server to resolve all nat problem. The
follow picture is the system architecture.
 
uac--nat-->outboud1(ser1+nathelper+rtpproxy)------------->ser(main)
uac--nat-->outboud2(ser2+nathelper+rtpproxy)-------------|
uac--nat-->outboud3(ser3+nathelper+rtpproxy)-------------|
 
Can someone know if ser can rewrite the uac's contact as itself ip address
and 
forward to main ser? Nathelper can rewrite sdp ip/port to it own ip/port.
But it 
only rewrite contac with nat's ip and port.
 
Jiangzhou
 
 




More information about the sr-users mailing list