[bars] 911 outage root cause revealed

[apizer at comcast.net]

Our tax dollars at work . . .

 

 

From: bars <bars-bounces at w1hh.org> On Behalf Of Juan Jiménez
Sent: Thursday, June 20, 2024 12:39 AM
To: Tim K1DC <k1dc.radio at gmail.com>
Cc: w1hh <bars at w1hh.org>
Subject: Re: [bars] 911 outage root cause revealed

 

... then there's the challenge of assuming the media is getting it right on the story. Heh.

 

I would love to see the official post-mortem analysis of the failure.

 

On Wed, Jun 19, 2024, 23:46 Tim K1DC <k1dc.radio at gmail.com <mailto:k1dc.radio at gmail.com> > wrote:

Interesting...  If one can take the report at face value they mention that the 911 centers could see the phone number of the caller and then was able to call them back.   Assuming this is a VoIP system, honestly what phone system isn't these days, this tells me that the SIP traffic was making it through but the audio data was not.  These are typically carried on different network ports and require specific firewall rules to allow them through.  There is a common problem with VoIP system refereed to as 'one-way audio' in which the calls are connected but only one of the parties can hear the other.  This situation is almost always caused by a misconfiguration of a firewall.  It could also have been a defense mechanism whereby some firewalls can block specific ports if it sees 'unusual' activity on a port.

If this was the case no amount of redundancy/failover would have helped - the system wasn't down, calls were still going through.

73,

T.

On 06/19/2024 22:03, Juan Jiménez wrote:

https://www.boston25news.com/news/local/massachusetts-officials-reveal-cause-hourslong-911-system-outage/FA22RGI3QBB6FBPWLJMKO7SOFM/

 

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