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Re: How to Blocking VoIP ( H.323) ?
> > > On Thu, 11 Nov 2004, Alexei Roudnev wrote: > > > Date: Thu, 11 Nov 2004 09:38:00 -0800 > > From: Alexei Roudnev <email@example.com> > > To: Christopher L. Morrow <firstname.lastname@example.org>, > > Irwin Lazar <email@example.com> > > Cc: Joe Shen <firstname.lastname@example.org>, NANOG <email@example.com> > > Subject: Re: How to Blocking VoIP ( H.323) ? > > > > > > Hmm - just introduce some jitter into your network, and add random delay to > > the short packets - and no VoIP in your company -:). > > > 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. > > > 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? > > In the grand scheme of things, and in an evolutionary context certainly, > many apps are likely to be proposed in the future, and worse still (in the > eyes of many) - IMPLEMENTED, which will likely compel network owners and > operators to adjust organizational and infrastructure strategies to meet > objectives. As with the introduction of any service or app into the mix, > accommodating something means a REQUISITE adjustment in existing > operational practices. > > But WRT VoIP, Consider that by JUST ONE account, the IP telephony market > is expected to be a US$1.4 billion business by 2008 - up from $934 million > in 2002. This market is expected to experience a annual growth rate of > 7.5% through 2008. > > Again, what is the point.. is it that you wish to block VoIP to in order > to DELAY/BUY MORE TIME toward implementing organizational change > (slow-rolling, if you are going to be rolling at all), or is it to > prohibit without reservation, any VoIP traffic over your netspace? Just > curious.. > > > Best, > Robert. > -------