Telcos run five-9 systems that fail 60% of the time

Posted on Tuesday 17 January 2006

OK, so the day’s sessions aren’t quite over, but I’m going to go out on a limb and call the best quote of the day (it’s the title of this post if you don’t want to read the development of the concept below).

I have oftened talked about (and written about but I can’t find the link) how incredibly inefficient it is to speak to someone with the traditional phone network. My rant usually goes along the lines of imagining a typical attempt to call someone. Here’s something approaching worst case, but you’d be surprised at how often this happens:

  1. Look up callee’s office number
  2. Dial 10 digits
  3. Speak to reception, get transferred
  4. Listen to ring, time out, get voice mail
  5. Decide to try mobile number instead, so hang up
  6. Look up mobile number (well, OK, hopefully this is still on the screen from Step 1, unless you are not at your screen …)
  7. Dial mobile number
  8. Listen to ring, time out, get voice mail
  9. Maybe leave a message here. But, I know some people that only use one voice mail in preference to the other
  10. Hang up. Redial office number
  11. Speak to receptionist, get transferred
  12. Wait for ring to time out and the “I’m not here now, please leave a message” prompt.
  13. Leave a message

Elapsed time can add up to several minutes, maybe up to 5 or more depending on the length of your message. Now, if this happens a few times a day, by the time you multiply it out across say a year of your time, or say across a day of your company’s collective staff’s time, it really adds up. This is the incredible time inefficiency of the PSTN network: most calls do not result in an actual connection. In fact, a reputed stat is that only 40% of dialed calls reach the intended recipient. (would love to get a real refence here if anyone has one)

Now, in this current session on presence Ed Simnett of Microsoft had a great quote “The telcos are the only companies I know that run five-9 systems that fails 60% of the time”. It captures this point just about perfectly.


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