RE: [Serusers] Multiple UA behind NAT and SIP Proxy Outside LAN - sr-users

29 Oct 2004

You can do either,

1. write your own C module to compare the src_ip and r-uri's ip address, or 

2. use exec_msg() to call a shell script. This function exports variables to
the shell. It is in ser admin guide section 4.1

Richard

...
  -----Original Message-----
 From: Allan [mailto:voip_tango@yahoo.ca]
 Sent: Friday, October 29, 2004 2:33 PM
 To: Richard
 Subject: RE: [Serusers] Multiple UA behind NAT and SIP Proxy Outside LAN

 Thanks Richard,

 How would this line look?  I have read through the
 admin  guide a number of times but have not seen how
 to do this.  How would I actually compare the src_ip
 variable with part of the uri?

 Regards,
 Allan

  --- Richard &lt;richard(a)o-matrix.org&gt; wrote:
  You can check if the src_ip and the r-uri's
ip
 address are the same. Just
 make sure this is done after lookup() and before
 being forwarded. This
 method has lots of limitations. Check the archive
 for more discussions. But
 most of time it is sufficient.

  -----Original Message-----
 From: serusers-bounces(a)lists.iptel.org  [mailto:serusers-bounces@lists.iptel.org]
On
  Behalf Of Allan
 Sent: Friday, October 29, 2004 2:08 PM
 To: Andris Parra L.; serusers(a)lists.iptel.org
 Subject: Re: [Serusers] Multiple UA behind NAT and  SIP Proxy Outside LAN

 I am also looking for a way to determine if two  UAs
  are behind the same NAT.  I have found that if I
 do
  not force rtp_proxy between two UAs known to be
 behind
  the same NAT, the call is setup and torn down
 through
  SER and RTP is sent directly between the two
UAs.
 This is how I want to call to operate.  I just  can't
  see a way via SER's scripting language to
make a
 decision based on the src_ip of the initial  request
  and a portion of the URI domain, which in my case
 is
  the IP address of the NAT.

 Regards,
 Allan

  --- "Andris Parra L." &lt;apl_1980b(a)yahoo.com&gt;  wrote:
  > I4m wondering if there is a way to
comunicate UA
 > agents betwen them that are behind the same nat,
 > they are working perfectly with the outside  world
  > (I4m not having problems with Nat
traversal),  but
  > they try to send the RTP and RTCP data to
the
 > aparent public IP that they are registered in  the
  > Sip Proxy, and of course, the multimedia
data  isn4t
  > processed by the router because the
destination  IP
  > is the one asigned to the WAN interface of
it  and it
  > sees it in the LAN interface.
 > I4m thinking that maybe the Sip Proxy (ser 0.14)
 > isn4t the problem, maybe the infraestructure is  not
  > enough, so, is there anything that you could
 answer
  > me tha guide me in this scenario?
 >
 > I4ll be grateful for any information you could  give
  > me.
 >
 >
 >
 >
 > Andris Parra L.
 > apl_1980b(a)yahoo.com
 > Ipsofactum LTDA.
 > www.ipsofactum.com
 >
 > ---------------------------------
 > Do you Yahoo!?
 > Express yourself with Y! Messenger! Free.  Download
  now.> 
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