[SR-Users] NAT problem

[Arnout Van Den Kieboom]

Hi,

Firewall (PFsense) does port forwarding:

inbound publicIP:5060 -->  private ip (192.168.150.119)

inbound PublicIP:10000 to 20000 -> private ip (192.168.150.119)

The public ip is set in the config file (kamailio.cfg) and RTP proxy is
started with

rtpproxy -A  "private ip" -F -l "local ip" -m 10000 -M 20000 -s udp:*:7722
-d INFO

In the cfg file NATtin is defined. (define with_nat)
rtpproxy module is loaded.

This works for most audio situations, except with the carrier
Also very important: the carrier i am using for testing requires
authentication, so I am using the uac module.

I can see the registration with the provider, i see the inbound call in
kamailio, I see the inbound call in asterisk.
A connection is set up like it should, but then there is One way audio.

The weird thing is:
this route works without a problem: carrier --> FW -->kamailio --> (back
through firewall) FW --> user subscribed to kamaiolio.
(which should imply the same NAT'ing problems?)

If you need more info, feel free to ask!

PS: What i haven't tried yet is to call from asterisk through kamailio to
the carrier number, this is what i'll set up and test next)

Arnout

Op ma 16 sep. 2019 om 13:26 schreef Daniel-Constantin Mierla <
miconda at gmail.com>:

> Hello,
>
> is Kamailio and RTPProxy (or Asterisk) using public IP addresses? Or they
> listen on a private address and the firewall does port forwarding of a
> public IP address?
>
> Cheers,
> Daniel
>
> On Mon, Sep 16, 2019 at 10:51 AM Arnout Van Den Kieboom <
> arnoutvdkieboom at gmail.com> wrote:
>
>> Hi,
>>
>> First of all, I'm really new to Kamailio. So sorry if I ask a stupid
>> question, or perhaps a really weird one.
>>
>> I started using kamailio in a test environment about a week ago.
>>
>> for setup i have the situation for inbound calls: Carrier --> FW (NAT)
>> --> Kamailio
>> for outbound to an asterisk box i have: Kamailio --> FW (NAT) --> Asterisk
>> for outbound to users i have: Kamailio --> FW (NAT) --> sip-phone
>> (yealink) or grandstream
>>
>> During that time i was able to :
>> Set up calls to users,
>> Use the dispatcher module
>> use the avpops module to do data lookups.
>> Get calls from asterisk to kamailio user to work.
>> Also calls between users (even though behind nat) are having good audio.
>>
>> I have installed rtpproxy and it works nicely.
>>
>> There is just one situation where it fails:
>>
>> Carrier --> FW (NAT) Kamailio --> asterisk
>>
>> There is only one way audio (from asterisk to carrier) but not from
>> carrier to asterisk.
>>
>> I believe I need to do something with the rtp proxy module ... and tried
>> different things (forcing the r flag, forcing the w flag)
>> Any idea where I might need to start looking? It's been driving me
>> crazy...
>>
>> Thanks
>>
>> Pemp
>>
>>
>> _______________________________________________
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>> sr-users at lists.kamailio.org
>> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>>
>
>
> --
> Daniel-Constantin Mierla - https://www.asipto.com
> https://twitter.com/miconda - https://www.linkedin.com/in/miconda
> Kamailio Advanced Training - https://www.asipto.com/u/kat
> _______________________________________________
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>
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