[asterisk-dev] G.729 codec problem

[Rosa De Santis]

Hi all.
I'm having this message when using G.729 codec, and the voice is chopped.

frame.c:179 __ast_smoother_feed: Dropping extra frame of G.729 since we already have a VAD frame at the end

Please, how can I fix this?
Is a configuration problem or I have to make a change in Asterisk code ???

Thanks.
Rosa.

----------------------------------------
> Date: Wed, 27 Sep 2006 09:03:36 +0100
> From: B.Candler at pobox.com
> To: jparker at digium.com
> Subject: Re: [asterisk-dev] Rate limiting traffic to address potential DoS	issues?
> CC: asterisk-dev at lists.digium.com
> 
> On Tue, Sep 26, 2006 at 05:02:56PM -0500, Jason Parker wrote:
> > Let's look at other apps (say, apache) for an example of something
> > similar.  What happens if you throw thousands of requests at apache per
> > second?  It's going to die.  And why shouldn't it?  Stuff like this, in my
> > opinion, is best handled at the firewall level, or perhaps with a load
> > balancer of sorts.
> 
> I think you may be comparing apples and oranges there.
> 
> HTTP runs over TCP. There are well-known denial of service attacks against
> TCP (e.g. half-open connections from spoofed source IP addresses) and
> well-known defences which can be implemented in the kernel or in firewalls
> (e.g. syn cookies). Therefore by the time Apache sees an incoming TCP
> request, these have been filtered out.
> 
> SIP generally runs over UDP, and so you don't get this protection. In fact
> there's very little generic protection that the kernel could offer.
> 
> In both Apache and Asterisk, as you say, if you overload the system with a
> large number of *valid* requests then they may fall over. I suspect that's
> not actually the problem under discussion; rather, that there are specific
> denial-of-service attacks of the spoofed IP variety against SIP.
> 
> However, without disclosure of what the actual attacks under consideration
> are, then it's very difficult to be specific about how they could be
> handled.
> 
> Equally, it's clear that any sort of attack can be managed by a firewall if
> it is sophisticated enough. But how many firewalls have full
> application-layer stateful support for SIP? And if there are any, which ones
> have been tested with Asterisk and certified by Digium?
> 
> Regards,
> 
> Brian.
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