21 Nov
2019
21 Nov
'19
12:43 p.m.
Hi,
You can also inspect the SDP and look for private or public IPs and perform some logic
based on that.
sdp_get_line_startswith("$avp(sdp_media_ip)", "c=");
if (is_ip_rfc1918("$(avp(sdp_media_ip){s.select,2, })")) {}
The delimiter for the transformation is an empty space in this case.
Hope this helps.
Regards,
Grant
From: sr-users <sr-users-bounces(a)lists.kamailio.org> On Behalf Of David Villasmil
Sent: donderdag 21 november 2019 09:38
To: Kamailio (SER) - Users Mailing List <sr-users(a)lists.kamailio.org>
Subject: Re: [SR-Users] How to retrieve local socket that will be used to send a message
from the branch route
[EXTERNAL EMAIL]
Hello,
I'm not sure this is the best or even the right way, but i do that by figuring out
where the call is coming from.
In my case, an INVITE from an RFC1918 IP address will always be internal to external and
vice versa.
i.e.:
# If the Source IP is an RFC1918 address, it's coming from an internal endpoint,
so the call is going out
if (is_ip_rfc1918("$si")) {
$dlg_var(rtp_direction) = "direction=internal direction=external";
} else {
$dlg_var(rtp_direction) = "direction=external direction=internal";
}
You may even check both origin and destination domain ($du) and configure rtpengine
accordingly.
onsend_route {
xlog("L_ERR", "[onsend_route] Packet going to $du\n" );
if (is_ip_rfc1918("$si") && is_ip_rfc1918("$du") ) {
# call is internal to internal
} else if (is_ip_rfc1918("$si") && !is_ip_rfc1918("$du"))
{
# call is internal to external
} else if (!is_ip_rfc1918("$si") && !is_ip_rfc1918("$du"))
{
# call is external to external
} else if (!is_ip_rfc1918("$si") && is_ip_rfc1918("$du"))
{
# call is external to internal
}
}
Hope that makes sense and help you a little.
Regards,
David Villasmil
email: david.villasmil.work@gmail.com<mailto:david.villasmil.work@gmail.com>
phone: +34669448337
On Thu, Nov 21, 2019 at 6:11 AM Patrick Wakano
<pwakano@gmail.com<mailto:pwakano@gmail.com>> wrote:
Hello list,
Hope you are all doing well!
I am trying to figure out a way to retrieve the local socket the t_relay() has decided to
use in a mhomed=1 env. Is there a way to do that? I couldn't find any variable other
than the $snd ones that maybe have this info, but I am not using onsend_route
anyway.....
I am after this value because this is what I can use to figure out if I need to engage
RTPEngine with parameters "external, internal", "external, external",
"internal, external" or "internal, internal". In my case, my server is
in between two networks, and calls can traverse or can be routed back to the same
interface depending on what was decide by the LCR module. Signalling is fine, but engaging
the RTPEngine must be done with the correct parameters to get the correct IPs in the SDP,
other else I get one way audio in the call.....
Any help is much appreciated!
Thank you!
Kind regards,
Patrick Wakano
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