[OpenSIPS-Users] Feature request - pseudo-variable for destination IP address

[Robert Dyck]

Using the ip transform to resolve the address worked for me. When I get around 
to it I should do it on opensips start up and cache the address

On Thursday, July 18, 2019 7:53:41 A.M. PDT Vitalii Aleksandrov wrote:
> Hi,
> 
> Original question was about different thing but the destination IP of a
> request or reply is not hard to get. I wrote a small module which
> extracts the destination uri from ru (du) for requests and from via for
> replies, makes a dns resolve if it's a domain name and then detects the
> outgoing interface of opensips and exports it as a PV to config. The
> goal was to configure rtpengine's direction to bridge between different
> interfaces. Adding just a few more lines of code will export the
> destination IP as a PV. Since I use dns cache module resolve happens
> only once and when t_relay() (tm module) searches for a destination it
> just reuses previously resolved values from cache. I can share it if
> anybody needs it.
> 
> > As far as I know, the equivalent variable to $si on the destination side
> > is either $dd, which may not always be set, or $rd. Those are not
> > guaranteed to be IP addresses, however. If DNS is being used, I don't
> > believe OpenSIPS provides the results of the DNS lookup to the script in
> > any variable, so I don't think there is a way to find the actual IP aside
> > from doing your own DNS lookup (or possibly using the dns_cache module
> > and snooping the cache, but I have had issues with this module in the
> > past.)
> > 
> > Ben Newlin
> > 
> > On 6/28/19, 10:16 AM, "Users on behalf of rob.dyck at telus.net" <users-
bounces at lists.opensips.org on behalf of rob.dyck at telus.net> wrote:
> >      Unfortunately the address of the interface where the request was
> >      receeived is private. I am using 1 to 1 NAT.
> >      
> >      ----- Original Message -----
> >      From: "Ovidiu Sas" <osas at voipembedded.com>
> >      To: "OpenSIPS users mailling list" <users at lists.opensips.org>
> >      Sent: Thursday, June 27, 2019 3:31:34 PM
> >      Subject: Re: [OpenSIPS-Users] Feature request - pseudo-variable for
> >      destination IP address
> >      
> >      Check out the $Ri pvar:
> >      https://www.opensips.org/Documentation/Script-CoreVar-3-0#toc78
> >      
> >      -ovidiu
> >      
> >      On Thu, Jun 27, 2019 at 6:23 PM rob.dyck at telus.net 
<rob.dyck at telus.net> wrote:
> >      > I was looking for something similar to the $si PV but for the
> >      > destination IP address. Either it doesn't exist or I am blind. I
> >      > can't find things in the refrigerator either.
> >      > 
> >      > The motivation.
> >      > 
> >      > I have a working instance of Opensips with a basic residential
> >      > configuration. I extended it to allow calling UAs on the LAN from
> >      > the outside. It is a typical residential LAN without a fixed IP
> >      > address. Dynamic DNS is working for me. I read the tutorial about
> >      > Opensips behind NAT. Following the recommendations there I was
> >      > able to setup rtpproxy, the advertised address and an alias for my
> >      > Opensips. Initial testing using a softphone on a laptop using
> >      > either WiFi or a mobile phone tethered to the laptop worked well.
> >      > However it seems that some UAs will not accept a domain name in
> >      > the SDP connection. The UAs that failed could be made to work by
> >      > coding in an IP address. This is not a satisfactory solution
> >      > because the router's address may chaange. There is probably some
> >      > convoluted way to import the needed address into the script.  A
> >      > pseudo-variable representing the destination IP address of the
> >      > received INVITE or 200 OK could then be passed as the advertised
> >      > address to the rtpproxy module.
> >      > 
> >      > Thank you for having a look.
> >      > Rob
> >      > 
> >      > _______________________________________________
> >      > Users mailing list
> >      > Users at lists.opensips.org
> >      > http://lists.opensips.org/cgi-bin/mailman/listinfo/users
> >      
> >      --
> >      VoIP Embedded, Inc.
> >      http://www.voipembedded.com
> >      
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> >      
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> > 
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