VoIP, Firewalls and NATs

["Mikael Johansson" <mikael (at) ingate.com>]

Dear Arturo

Ingate Systems have been providing Firewalls with SIP proxy and support for NAT traversals since 2001. As mentioned below there are alternatives and I believe more vendors are striving to add this support.

Regards
 Mikael



> -----Original Message-----
> From: Voipsec-bounces (at) voipsa.org [mailto:Voipsec-bounces (at) voipsa.org] On
> Behalf Of Matthias Krawutschke
> Sent: Saturday, February 04, 2006 2:24 PM
> To: Arturo Servin
> Cc: Voipsec (at) voipsa.org; Matthias Krawutschke
> Subject: Re: [VOIPSEC] VoIP, Firewalls and NATs
> 
> Hey Arturo,
> 
> well i had some problems with CheckPoint FW-1 NG and NGX with VoIP.
> MyServer has an official IP - Address and was in DMZ - Area; My Rules
> allow
> That this VoIP - Server goes out directly. But Checkpoint changed the UDP
> - Port and the answer doesn´t find the server. At this time I had change
> that
> and I use a PROXY - Firewall - System from Borderware. It works very fine
> and I had no problems with VoIP, NAT, etc.
> 
> Kind regards
> 
> Matthias
> 
> 
> -----Ursprüngliche Nachricht-----
> Von: Voipsec-bounces (at) voipsa.org [mailto:Voipsec-bounces (at) voipsa.org] Im
> Auftrag von Arturo Servin
> Gesendet: Samstag, 4. Februar 2006 13:16
> An: Voipsec (at) voipsa.org
> Betreff: [VOIPSEC] VoIP, Firewalls and NATs
> 
> 
> 
>             I am doing a personal research about VoIP security and the use
> of firewalls, IPS and NAT. I remember some issues a couple of years ago
> specifically with NAT and H.323. I guess there was the same problem with
> SIP. Also I remember a topic in this email list about SIP proxys. Do you
> know if there are still issues with Firewalls/NAT/IPS and VoIP, how the
> vendors and protocols are dealing with this? Any comments?
> 
> 
> 
> Thanks in advance,
> 
> -as
> 
> _______________________________________________
> Voipsec mailing list
> Voipsec (at) voipsa.org
> http://voipsa.org/mailman/listinfo/voipsec_voipsa.org
> 
> _______________________________________________
> Voipsec mailing list
> Voipsec (at) voipsa.org
> http://voipsa.org/mailman/listinfo/voipsec_voipsa.org

_______________________________________________
Voipsec mailing list
Voipsec (at) voipsa.org
http://voipsa.org/mailman/listinfo/voipsec_voipsa.org