txt.att.net outage?

Tim Burke tim at mid.net
Fri Jan 20 14:54:49 UTC 2023

Yep... SNPP or WCTP are typically what is used for the "enterprise messaging" product that the carriers offer. Most of them require either authentication, or providing a list of authorized destination numbers in advance to cut down on abuse.

From: NANOG <nanog-bounces+tim=mid.net at nanog.org> on behalf of Aaron de Bruyn via NANOG <nanog at nanog.org>
Sent: Friday, January 20, 2023 8:28:39 AM
To: dwalters at omnigo.com; William Herrin
Cc: NANOG mailing list
Subject: Re: txt.att.net outage?

I guess SNPP is still a thing:

$ host snpp.att.net<http://snpp.att.net>
snpp.att.net<http://snpp.att.net> is an alias for snpp.att.unimobile.com<http://snpp.att.unimobile.com>.
snpp.att.unimobile.com<http://snpp.att.unimobile.com> is an alias for snpp-att.gmes.syniverse.com<http://snpp-att.gmes.syniverse.com>.
snpp-att.gmes.syniverse.com<http://snpp-att.gmes.syniverse.com> has address
$ telnet 444
Connected to
Escape character is '^]'.
220 SNPP Gateway Ready
telnet> quit
Connection closed.


On Fri Jan 20, 2023, 02:24 PM GMT, Aaron de Bruyn<mailto:aaron at heyaaron.com> wrote:
txt.att.net<http://txt.att.net> is returning MX records and those machines don't have port 444 open...

Wouldn't you want to be sending something like a SNPP message instead? It's a much less convoluted delivery process and is almost real-time (no queuing).

I guess it's been a decade or so since I've dealt with emergency services and paging...is SNPP even a thing anymore?

I looked at some old code I wrote (https://github.com/darkpixel/snppsend/blob/master/more-providers), and it doesn't look like snpp.attws.net<http://snpp.attws.net> exists.


On Fri Jan 20, 2023, 02:12 PM GMT, William Herrin<mailto:bill at herrin.us> wrote:
On Thu, Jan 19, 2023 at 8:09 PM Dan Walters via NANOG <nanog at nanog.org> wrote:
Know this is a longshot, any chance anyone from the txt.att.net domain might be able to help us with what we believe is a blacklist block or possibly an outage?
We deal with 911 cad dispatching and is affecting first responders so looking to see if there is a faster way to resolution.

Hi Dan,

As I understand it, txt.att.net is a low-volume courtesy service not
intended for important communications. A paid service like Twilio can
handle production-grade SMS delivery.

Bill Herrin

For hire. https://bill.herrin.us/resume/
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