[VoiceOps] False 911 calls and old abandoned DID

Dave Frigen dfrigen at wabash.net
Fri Jan 22 09:17:22 EST 2021

I’m a 42 year veteran of the industry who worked on electromechanical switching in the late 70’s, the rest is history. Correct to lower number pulses being lower number digits in switching. If your switch is still “rotary” capable you can still hookswitch dial complete phone numbers to complete calls.




From: VoiceOps <voiceops-bounces at voiceops.org> On Behalf Of Jeff Shultz
Sent: Thursday, January 21, 2021 5:51 PM
To: Voiceops.org <voiceops at voiceops.org>
Subject: Re: [VoiceOps] False 911 calls and old abandoned DID


That would be odd....  one of the reasons that big cities in the US got area codes like 212 was because it was shorter to dial with fewer pulses needed. Hawaii got stuck with 808.... 


On Thu, Jan 21, 2021 at 3:43 PM Pete Mundy <pete at mac.geek.nz <mailto:pete at mac.geek.nz> > wrote:

So close! But on the PoTS equipment I'm familiar with (others can chime in and correct me if I'm wrong on a larger scale) the numbers are reversed

(well for all except 5 :)

Basically it counts down from 10. 1 pulse is digit '9', 4 pulses is digit '6', 10 pulses is digit '0'.

So do dial 911 you need:

        1 brief loop interruption
        9 brief loop interruptions
        9 brief loop interruptions

<wield flame suit>


> On 22/01/2021, at 12:07 PM, Mike Johnston <mjohnston at wiktel.com <mailto:mjohnston at wiktel.com> > wrote:
> <snip>
> One interrupt represents the digit "1" being dialed.  Two rapid interrupts represents the digit "2", and so on.  You need to have at least a brief timeout 
> <snip>
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Jeff Shultz


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