[bars] 911 outage root cause revealed

[Juan Jiménez]

... 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> 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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