Cisco NBAR picks up voip traffic.. (althought it wouldn't pick it up in daves case) im sure there are solutions from other venders that telecom would use to pick up the port the rtp's on etc.. It would just be really cpu intensive.. and cost more to do than it would benefit them.. -----Original Message----- From: Dave Green [mailto:dave.green(a)paradise.net.nz] Sent: Friday, 18 March 2005 1:55 p.m. Cc: nznog Subject: Re: [nznog] telecom planning to break VoIP over its network? Joe Abley wrote:
http://www.pbs.org/cringely/pulpit/pulpit20050317.html
"And there are other dirty tricks available to broadband ISPs. Telecom New Zealand, for example, is reportedly planning to alter TCP packet interleaving to discourage VoIP. By bunching all voice packets in the first half of each second, half a second of dead air would be added to every conversation, changing latency in a way that would drive grandmothers everywhere back to their old phone companies. This is because phone conversations happen effectively in real time and so are very sensitive to problems of latency. Where one-way video and audio can use buffering to overcome almost any interleaving issue, it is a deal-breaker for voice."
It's implied here that they identify the VOIP packets in order to bunch them. My VOIP tie line run across an encryted UDP VPN link so I can't see how they could affect just my VOIP traffic. Dave _______________________________________________ NZNOG mailing list NZNOG(a)list.waikato.ac.nz http://list.waikato.ac.nz/mailman/listinfo/nznog