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

[Johan De Clercq]

I am interested

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________________________________
Van: Users <users-bounces at lists.opensips.org> namens Vitalii Aleksandrov <vitalik.voip at gmail.com>
Verzonden: donderdag, juli 18, 2019 4:56 PM
Aan: users at lists.opensips.org
Onderwerp: Re: [OpenSIPS-Users] Feature request - pseudo-variable for destination IP address

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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