Is SIP 2.0 support available in IP-table

Is SIP 2.0 support available in IP-table

[Yuwei Zhao (Wei)]

Hi, a quick question.

Does IP-table support SIP 2.0 so I can put a SIP-telephone behind it?

Best regards

/Wei

Re: Is SIP 2.0 support available in IP-table

[Edmundo Carmona]

I guess you have to look in telephony projects. netfilter is just a
firewall... up to ISO layers 3 or 4 (in vanilla kernels) (unless you
use things like l7 extensions ;)).

On 9/9/05, Yuwei Zhao (Wei) <wei@weistar.com> wrote:
> 
> Hi, a quick question.
> 
> Does IP-table support SIP 2.0 so I can put a SIP-telephone behind it?
> 
> Best regards
> 
> /Wei
> 
> 
>

Re: Is SIP 2.0 support available in IP-table

[Edmundo Carmona]

I guess you have to look in telephony projects. netfilter is just a
firewall... up to ISO layers 3 or 4 (in vanilla kernels) (unless you
use things like l7 extensions ;)).

On 9/9/05, Yuwei Zhao (Wei) <wei@weistar.com> wrote:
> 
> Hi, a quick question.
> 
> Does IP-table support SIP 2.0 so I can put a SIP-telephone behind it?
> 
> Best regards
> 
> /Wei
> 
> 
>

Re: Is SIP 2.0 support available in IP-table

[Cedric Blancher]

Le dimanche 11 septembre 2005 à 00:04 -0400, Edmundo Carmona a écrit :
> I guess you have to look in telephony projects. netfilter is just a
> firewall... up to ISO layers 3 or 4

And 5 for some protocols such as FTP or IRC for thoses some other
connections are needed (FTP data, IRC DCC), with in protocol parameters
negociation. You then have to track the protocol in order to spot thoses
connections and be able to conntrack and/or nat the full session.

SIP is somehow a protocol of this kind, assuming you want to track all
connections implied by an IP phone. So it's not irrelevant for Netfilter
to "support" SIP, just like FTP, IRC, and others.

BTW, there's a sip-conntrack-nat module in patch-o-matic extra
repository. Maybe it can help OP.


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Re: Is SIP 2.0 support available in IP-table

[/dev/rob0]

On Friday 2005-September-09 18:05, Yuwei Zhao (Wei) wrote:
> Does IP-table support SIP 2.0 so I can put a SIP-telephone behind it?

This hasn't been revised in almost 2 years, but ...
http://www.netfilter.org/documentation/FAQ/netfilter-faq-1.html#ss1.8

There are many good workarounds, if NAT is the problem. You could use 
VPNs with RFC 1918 IP addresses, for one thing. Another possibility is 
local Asterisk servers on both ends of your voice connection. They can 
communicate via the NAT-friendly IAX protocol, and your SIP clients 
register with their local Asterisk.
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