22 Nov
2019
22 Nov
'19
6:51 a.m.
Just rectifying about the $snd variable. While the wiki tells that $snd ==
$sndfrom, I discovered that the $snd == $sndto.
So in my case, the $sndfrom(ip) gives me the local socket the message is
being sent.
However this only works from the onsend_route. I wasn't using this route at
all, so now I need to check whether a call to rtpengine_offer will properly
work from it.....
On Fri, 22 Nov 2019 at 10:01, Patrick Wakano <pwakano(a)gmail.com> wrote:
Yes David, we have all sorts of weird things
(specially legacy
installations where creativity really shined....). Also, in some private
network architectures my external interface may not have a public IP at
all....
Anyway, I first thought about applying some logic on the destination IP,
but it is only reliable if I know my routing table, and this task Kamailio
already performs when relaying.... The easiest way for now seems to save
the info in the DB, so I explicit tell from which socket each GW is
reachable....
And for curiosity I attempted the $snd() variables but they don't have the
socket information.... the $snd(ip) has the destination IP, not my local
socket as the doc may suggest.....The $branch variable (
http://www.kamailio.org/wiki/cookbooks/5.2.x/pseudovariables#branch_name_-_…)
was promising but I couldn't figure out when it is set. In my branch_routes
it is always null......
On Fri, 22 Nov 2019 at 09:15, David Villasmil <
david.villasmil.work(a)gmail.com> wrote:
Hello,
Interesting challenge you’ve got.
It may fail in cases where my kernel routing table has some rule where a
private IP is reachable via my external interface but different GW for
example
In this case then, the $du will be a rfc1918 ip but the outgoing
interface will be a public ip?
Have you tried $send(name) ?
The docs state:
Send Address Attributes
$sndfrom(name)
*$snd(name)* - return attributes of the address from where the request
is going to be sent (local socket).
On Thu, 21 Nov 2019 at 22:57, Patrick Wakano <pwakano(a)gmail.com> wrote:
Thanks for the replies and examples! Much
appreciated!
I was thinking of something similar to David suggestion, but I think
this is not 100% reliable. It may fail in cases where my kernel routing
table has some rule where a private IP is reachable via my external
interface but different GW for example (multiple IPs in the same interface
or more complex network architecture with VPN or direct link with some
endpoint).... So given Kamailio already consults the kernel looking for the
correct interface to a given destination, I thought this is actually the
correct information I should use in my script. The only problem is that
apparently Kamailio is not exposing this info for the script writer....
Karsten suggestion should probably work but in short this is just a way
to statically save in DB the network routing information I know before
hand. If this route changes (which should not happen often I agree) then I
have to update the DB. And also this DB data could be replaced by some
logic in my script if I had access to the chosen socket... That's exactly
the purpose of having mhomed=1 in the script, I don't need to save socket
info for all my GWs in DB because I am letting Kamailio automatically
decide it. And it does pretty well! The only problem now is that I don't
know what this decision was and I need it to implement the RTPEngine logic
in my script based on the interface the INVITE will go out.
Happy to hear more ideas!
Thanks,
Kind regards,
Patrick Wakano
On Thu, 21 Nov 2019 at 20:07, Karsten Horsmann <khorsmann(a)gmail.com>
wrote:
--
Regards,
David Villasmil
email: david.villasmil.work(a)gmail.com
phone: +34669448337
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Hi Patrick,
If you don't use tls at this moment, the config from sbc OS is also an
good example of using dispatcher with the socket params to select the right
sendsock and using vars to give rtpengine the right internal / external
directions. They use numbers for internal and external. To figure out where
the direction is, this config use pseudo vars for receiving local socket
https://github.com/voiceboys/sbcOS/blob/master/SbcOS/configs/voice/kamailio…
Cheers
Karsten Horsmann
Patrick Wakano <pwakano(a)gmail.com> schrieb am Do., 21. Nov. 2019,
07:11:
> 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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