A lot of fellows here use Asterisk or Freeswitch as a proxy/SBC for calling PSTN. I would suggest you open another thread to discuss about this subject. Kamailio can act as a UA, but I am not sure about what you trying to achieve.

Cheers!

Moacir

From: aelsharqawi@live.com
To: sr-users@lists.sip-router.org
Date: Wed, 20 Mar 2013 13:42:48 +0300
Subject: Re: [SR-Users] NAT & Firewall Issues

Thanks a lot,

I’ve another question. May I use Kamailio as outbound proxy?

Regards,

Amr

From: sr-users-bounces@lists.sip-router.org [mailto:sr-users-bounces@lists.sip-router.org] On Behalf Of Moacir Ferreira
Sent: Wednesday, March 20, 2013 1:10 PM
To: Kamailio Mail List
Subject: Re: [SR-Users] NAT & Firewall Issues

So be careful! When Kamailio finds any end point using private address it will use RTPproxy. Both clients will then send their RTP to the RTPproxy. RTP (Real Time communications) does not like delays, jitter, etc. If your virtual machine does not have good resources, then the voice will be just bad. Kamilio and RTPproxy does not require that much power but the resources MUST be consistent, meaning it will not be affected by other VM running on the system so it will not have delays and jitter.

I run Kamailio on very low resource systems like 32 bits Intel based notepads with 512M RAM and it works just great... Try installing it on a physical machine.

Good luck!

Moacir

From: aelsharqawi@live.com
To: sr-users@lists.sip-router.org; miconda@gmail.com
Date: Wed, 20 Mar 2013 07:38:36 +0300
Subject: Re: [SR-Users] NAT & Firewall Issues

Hello Moacir,

Yes, my Kamailio server is on virtual machine & it’s connected direct to the internet.

Regards,

Amr

From: sr-users-bounces@lists.sip-router.org [mailto:sr-users-bounces@lists.sip-router.org] On Behalf Of Moacir Ferreira
Sent: Tuesday, March 19, 2013 10:00 PM
To: Kamailio Mail List; miconda@gmail.com
Subject: Re: [SR-Users] NAT & Firewall Issues

NATed solutions with no RTP proxies will depend on the client side, not on the server side like in Kamailio. Key things to notice:

1 - Private IPs (RFC-1918) will always be proxied if you don't change the basic template config;
2 - Dual NIC servers require a little bit more knowleadge on Kamailio before you can get it to work properly;
3 - Although you can use some tricky configurations, Kamailio is not a SBC like Asterisk/Freeswitch;

Having said that, RTPproxy is just good. I mean, it is really good! If it is not working, then you probably have another problem. So the questions are: Are you running your system on virtual machines? What is your topology? How many NICs do you have? Your Kamailio server is connected direct to the Internet or behind a firewall?

All the above questions can strongly affect the quality of your calls.

Cheers!

Moacir

From: aelsharqawi@live.com
To: sr-users@lists.sip-router.org; miconda@gmail.com
Date: Wed, 20 Mar 2013 02:09:44 +0800
Subject: Re: [SR-Users] NAT & Firewall Issues

Thanks All,

Yes, please if you've an example using nathelper without rtp proxy let us know.

now more than ten days I am trying to get kamailio up & running to bypass NAT & firewall blocking but I couldn't.

After some research I might create a VPN.

so please if you have any working example for NAT and Firewall let us know.

Regards,
Amr

> From: julian_q@hotmail.com
> To: miconda@gmail.com; sr-users@lists.sip-router.org
> Date: Tue, 19 Mar 2013 11:19:49 -0500
> Subject: Re: [SR-Users] NAT & Firewall Issues
>
> Daniel
>
> Do you have a config example using nathelper without rtp proxy?
>
> Regards
>
> Julián
>
>
> -----Mensaje original-----
> De: sr-users-bounces@lists.sip-router.org
> [mailto:sr-users-bounces@lists.sip-router.org] En nombre de
> Daniel-Constantin Mierla
> Enviado el: martes, 19 de marzo de 2013 10:00 a.m.
> Para: Kamailio (SER) - Users Mailing List
> Asunto: Re: [SR-Users] NAT & Firewall Issues
>
> Hello,
>
> rtpproxy could bring some delays, as another hop in rtp path. But usually is
> not noticeable, unless rtpproxy is on a slow network.
>
> Look at the traffic coming to rtpproxy and going out (with wireshark or
> similar tool) to be sure you have delays from rtpproxy.
>
> Cheers,
> Daniel
>
> On 3/19/13 8:49 AM, Amr Elsharqawi wrote:
> > Hello,
> >
> > I am facing NAT & Firewall problems how I can solve this issue I've
> > tried RTPProxy but voice quality is bad.
> >
> > any tutorial, please
> >
> > Amr
> >
> >
> > _______________________________________________
> > SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing
> > list sr-users@lists.sip-router.org
> > http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
>
> --
> Daniel-Constantin Mierla - http://www.asipto.com
> http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
> Kamailio World Conference, April 16-17, 2013, Berlin
> - http://conference.kamailio.com -
>
>
>
> _______________________________________________
> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
> sr-users@lists.sip-router.org
> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users

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