Roy Schestowitz <newsgroups@xxxxxxxxxxxxxxx> espoused:
> Open source VOIP connects to business
>
> ,----[ Quote
>| Nearly three years since Jon "maddog" Hall predicted that "VOIP using
>| an open source solution, such as Asterisk, will generate more business
>| than the entire Linux marketplace today," open source VOIP for the
>| enterprise remains a wild frontier.
> `----
>
> http://www.pcworld.idg.com.au/index.php/id;822679902;fp;2;fpid;2
>
> Open-Source VOIP Made Easy
>
> ,----[ Quote ]
>| Review: AsteriskNow GUI lowers barriers to entry and eases the
>| transition from testing to deployment.
> `----
>
> http://www.eweek.com/article2/0,1895,2105745,00.asp
>
Asterisk is very excellent indeed, and the new digium appliance is going
to have a profound effect on the PBX industry. What will stop VoIP from
becoming any kind of serious threat to traditional voice, though, is
the lack of streaming support in IP. In order to do proper streaming,
you need deterministic networking in the core of networks, ideally, with
paths tandemed right out to the terminating devices. This issue remains
one of the most misapprehended in the whole IETF world, and the failure
of the ITU to publish for free usage it's enormous body of information
merely continues the ignorance in this area.
There are some useful papers on this subject here:
http://en.wikipedia.org/wiki/Carrier_ethernet_transport
The technology, however, is certainly not limited to carrier-only usage.
The same capabilities could easily be achieved in corporate campuses
using existing linux kernel capabilities - the fundamental requirement
being that the two traffic types (deterministic & best effort) cannot be
mixed above layer 2. This means that for traditional ethernets, you'll
need two sets of cabling, or for fibre, either WDM or two sets of
fibres. WDM probably being the easiest.
The big advantage? Imagine all your net-based streams being reliable,
no matter what? No more glitches, frozen frames, error-constellations,
clicks, bangs and so-on. Voice, music and video which just works.
Special technology? Nope - linux can do it now. Cisco, however, do not
want you to know about this.
--
| Mark Kent -- mark at ellandroad dot demon dot co dot uk |
| Cola faq: http://www.faqs.org/faqs/linux/advocacy/faq-and-primer/ |
| Cola trolls: http://colatrolls.blogspot.com/ |
|
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