> 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: [email protected] > [mailto:[email protected]] 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" <[email protected]> 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: [email protected] > > > W: http://www.3c.co.uk > > > > > > > > > -- > > > > > > > > > _____________________________________________________________________ > > > -- Bandwidth and Colocation Pr... > > > > > > > -- > > _____________________________________________________________________ > > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > > > > asterisk-biz mailing list > > To UNSUBSCRIBE or update options visit: > > http://lists.digium.com/mailman/listinfo/asterisk-biz > > -- > David Knell, Director, 3C Limited > T: +44 20 3298 2000 > E: [email protected] > W: http://www.3c.co.uk > > > -- > _____________________________________________________________________ > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > > asterisk-biz mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-biz > > -- David Knell, Director, 3C Limited T: +44 20 3298 2000 E: [email protected] W: http://www.3c.co.uk -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-biz mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-biz
