North American Network Operators Group

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RE: Automated DLR conflict detection

  • From: Sean Donelan
  • Date: Sun Dec 30 19:04:01 2001

On Sat, 29 Dec 2001, Kevin Gannon wrote:
> Guys sorry to jump in mid thread, however some of you might
> know how do the voice carriers handle SLA's. I know our telco
> voice guys seem to live on SLA's.
> I can not rember the last time there was any kind of widespread
> voice outage on an international network.

Telephone companies use SLA's to exclude many types of outages from
their reporting statistics.  Large telephone users (telemarketers,
call centers, etc) have many of the same difficulties data people
have with carriers.  Third-party  measurements of telephone call
completion rates come up with much lower numbers than the carriers

The international telephone network is extremely vulnerable to
congestion.  And several developing countries have almost perpetual
problems with their telephone systems.

"Widespread" is one of those vague terms.  If your phone works, is
it a widespread problem?  Not even the ITU collects statistics on
the performance of the global telephone network.  Even monopoly PTTs
consider it proprietary information.