Is there a tool that will allow me to automatically change sip headers in 
realtime?

--- On Wed, 26/5/10, Motiejus Jakštys <desired....@gmail.com> wrote:


From: Motiejus Jakštys <desired....@gmail.com>
Subject: Re: [asterisk-users] Help with IP Routing
To: "Asterisk Users Mailing List - Non-Commercial Discussion" 
<asterisk-users@lists.digium.com>
Date: Wednesday, 26 May, 2010, 1:17 PM


Assume previous IP is LAN. Forwarding public IP ports to LAN is
straighforward. However, with SIP headers you will (don't know H323)
have to modify outgoing SIP headers: replace LAN ip with WAN ip.
For callers you have to substitute RTP destination IP
For callees you have to substitute RTP source IP.

I`m afraid you will have to check more details here:
http://www.ietf.org/rfc/rfc3261.txt
Maybe client sends server it's own IP address?

However, dumb header substitution + port range forwarding should work
in all cases for SIP.

On Wed, May 26, 2010 at 3:55 PM, Nivin Kumar <nivinkuma...@yahoo.in> wrote:
>
> Hello,
>
> I'm in a bit of a fix. We have a particular Windows based softswitch which is 
> has its SIP and H323 ports hardcoded to listen on a particular IP address. 
> The problem is that the ISP is having major issues and we can no longer 
> depend on them for service. The softswitch will not listen on any other IP 
> address and this can not be fixed. I was thinking of creating a NAT network 
> wherein we will forward all traffic from another public ip address to this 
> server, however I'm not sure how this will work. Do I need to modify the sip 
> headers? Any thoughts or suggestions?
>
> Thanks,
> Nivin
>
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