How to Blocking VoIP ( H.323) ?

Fri Nov 12 10:35:18 UTC 2004

After reading your kindly reply, I got following 
list for blocking VoIP at edge router:

1. block traffic on port 1719, 1720 (both tcp/udp),
   but this could not deal with those who modified 
   signaling port;

2. content filtering by using some special euqipment;
   , very expensive

3. legismation by gov., well I don't think this could
   be a method possible 

4. ???? for IM with voice ability

5. change QoS level for marked packets, 
   (how could it be done with no QoS network, RED ?)

here goes my further question:

a) Could WRED be applied with current network for VoIP
packets selectively? ( I means RTP packets carrying
unwanted VoIP )

b) Is there anyway to cache those equipment modifying
signaling port number? 

c) any better way ? any experience?

regards

Joe 

 --- Robert Mathews <mathews at hawaii.edu> wrote:   
> 
> 
> 
> On Thu, 11 Nov 2004, Christopher L. Morrow wrote:
> 
> > Date: Thu, 11 Nov 2004 19:49:10 +0000 (GMT)
> > From: Christopher L. Morrow
> <christopher.morrow at mci.com>
> > To: Robert Mathews <mathews at hawaii.edu>
> > Cc: NANOG <nanog at merit.edu>
> > Subject: Re: How to Blocking  VoIP ( H.323) ?
> >
> > On Thu, 11 Nov 2004, Robert Mathews wrote:
> > >
> > >
> > > To Joe Shen:
> > >
> > > Perhaps 'I am failing to see it' but, what can
> be gained by blocking VoIP
> > > traffic other than freeing bandwidth and CPU
> churnings?
> >
> > reference panamanian gov'ts choice to protect
> legacy/incumbant carrier
> > business by blocking voip. no one said it was
> 'smart' just that it was
> > what the gov't wanted. Perhaps Joe lives in a
> similar situation?
> 
> 
> Hi Chris:
> 
> Indeed....  hegemonic tendencies/behaviour by telcos
> aside, I was
> attempting to understand if there were 'some'
> ORGANIZATIONAL dyscrasias
> that prohibited 'operationlizing' of VoIP.  To be
> brief, I would humbly
> submit that any malady in this area is worthy of
> greater exploration IF
> ONLY to expedite and effectuate the alignment of
> org-to-org operational
> instruments and their respective interfaces.
> 
> 
> Best,
> Robert.
> -------
>  

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