Re: How to Blocking VoIP ( H.323) ?

["Alexei Roudnev" <alex () relcom net>]

I agree with Robert. But if you deal with some super tricked protocols (like
SpyPE) and you really want to block VoIP (not show that you comply to
regulations, but REALLY block it) - disruption looks as the only real
opportunity. For any filterig, I can always create a protocol which will
ignore your filters.


----- Original Message ----- 
From: "Robert Mathews" <mathews () hawaii edu>
To: "NANOG" <nanog () merit edu>
Sent: Saturday, November 13, 2004 11:12 AM
Subject: Re: How to Blocking VoIP ( H.323) ?


> On Fri, 12 Nov 2004, Alexei Roudnev wrote:
>
> > Date: Fri, 12 Nov 2004 09:46:15 -0800
> > From: Alexei Roudnev <alex () relcom net>
> > To: Robert Mathews <mathews () hawaii edu>, NANOG <nanog () merit edu>
> > Subject: Re: How to Blocking  VoIP ( H.323) ?
> >
> > > Alexei:
> > >
> > > How exactly then would anyone implement this, without screwing-up the
> > > overall performance elements in the network?  :)
> >
> > Not too easy, but I can imagine few alghoritms doing it. Remember that
VoIP
> > uses short packets, and you cam always recognize Ack and Tcp packets
which
> > should not be disrupted. Jitter does not slow down network, except if it
> > interacts with RTT calculartion in TCP/IP.
>
>
> Alexei:
>
> Apologize for the delay in getting a reply to you.
>
> Regarding your comment on jitter, FLATLY or more generally, if introducing
> jitter is likely to complicate operational matters elsewhere in the
> network [whether this complication manifests within one's own network or
> in another - to which one is inter-connected] I would be inclined to say
> this effects the overall performance...
>
> I did not mean to take more of your time on this.  But, I wanted to merely
> clarify.
>
>
> Best,
> Robert.
> -------