[asterisk-biz] PRI vs SIP vs ???

[David Knell]

> It may be different in the UK. 5-9s is the expectation with LECs in the US.
> Many of us have had T1s that have been up for a dozen years with no
> failures.

Don't think there's that much difference between the UK and the US -
people here expect a PRI circuit simply not to go wrong (which, if I'm
being pedantic, is even more stringent than 5x9s..)  But they do.
99.999% means that, for every customer who has a day-long outage in a
given year owing to someone digging up their cable [and we all know
someone to whom that's happened], nearly three hundred have to have no
outage at all during that year to maintain the batting average.

--Dave


> 
> --Don
> 
> 
> 
> 
> -----Original Message-----
> From: asterisk-biz-bounces at lists.digium.com
> [mailto:asterisk-biz-bounces at lists.digium.com] On Behalf Of David Knell
> Sent: Saturday, October 30, 2010 10:59 AM
> To: Commercial and Business-Oriented Asterisk Discussion
> Subject: Re: [asterisk-biz] PRI vs SIP vs ???
> 
> On Sat, 2010-10-30 at 06:13 -0400, Zeeshan Zakaria wrote:
> > Doesn't matter how good VoIP is, there is no comparison with a real
> > physical line. For absolutely 0 tolerance, guaranteed voice quality
> > and 99.999% uptime, a physical T1 is the only solution.
> 
> A physical T1 won't give you 99.999% uptime (that's five minutes of
> downtime every year), and a semi-decent VoIP solution can give
> guaranteed quality: we used to offer SDSL lines direct into our
> platform, run G.711 over them and the quality was indistinguishable from
> calls running over a PRI.
> 
> --Dave
> 
> > However as it is becoming an increasing trend in North American
> > market, including many major and big (careless) corporations, to
> > switch to cheap and crap voice quality and let the callers suffer, so
> > if the customer doesn't care about quality, reliability and stability,
> > SIP only solution should just be perfectly fine. Poor ordinary public
> > is after all made to get used to it anyways.
> > 
> > 
> > Zeeshan A Zakaria
> > 
> > --
> > www.ilovetovoip.com
> > www.pbxforall.com (beta)
> > 
> > > On 2010-10-30 4:50 AM, "David Knell" <dave at 3c.co.uk> wrote:
> > > 
> > > Hi Brian,
> > > 
> > > 
> > > 
> > > > Gotta client that is moving to a VoIP PBX. Will need 10 concurrent
> > > > calls with ability to grow ...
> > > 
> > > Option (a) gives you diversity - ask yourself just how bad it'd be
> > > if
> > > their phone system went down because their DSL line wasn't working,
> > > and
> > > then balance this against the extra cost of the PRI.
> > > 
> > > --Dave
> > > 
> > > 
> > > > --
> > > 
> > > 
> > > >
> > > _____________________________________________________________________
> > > > -- Bandwidth and Colocatio...
> > > 
> > > David Knell, Director, 3C Limited
> > > T: +44 20 3298 2000
> > > E: dave at 3c.co.uk
> > > W: http://www.3c.co.uk
> > > 
> > > 
> > > --
> > > 
> > > 
> > > _____________________________________________________________________
> > > -- Bandwidth and Colocation Pr...
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> > 
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> -- 
> David Knell, Director, 3C Limited
> T: +44 20 3298 2000
> E: dave at 3c.co.uk
> W: http://www.3c.co.uk
> 
> 
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-- 
David Knell, Director, 3C Limited
T: +44 20 3298 2000
E: dave at 3c.co.uk
W: http://www.3c.co.uk