This may be the issue Here are some details on this Government protocol implemented by all Telecom Carriers. Why it is being done? To support FCC mandate for STIR/SHAKEN, an industry set of rules designed to authenticate and validate CallerID information associated with phone calls using digital signatures. SHAKEN/STIR is a framework of interconnected standards. SHAKEN/STIR are acronyms for Signature-based Handling of Asserted Information Using tokens (SHAKEN) and the Secure Telephone Identity Revisited (STIR) standards. What is the benefit to the clients being impacted (what do they get as a result)? Provide a means to mitigate/eliminate illegally spoofed calls from RoboCallers. From: NANOG <nanog-bounces+jsimmons=semmes-murphey.com@nanog.org> On Behalf Of Tim Burke Sent: Friday, January 20, 2023 8:21 AM To: Dan Walters <dwalters@omnigo.com>; nanog@nanog.org list <nanog@nanog.org> Subject: Re: txt.att.net outage? EXTERNAL EMAIL FWIW, AT&T does not suggest using the txt.att.net<http://txt.att.net> email for anything critical. In a previous role I handled public safety CAD, and AT&T (and Verizon, if I remember correctly) made it very clear that if you want to be able to send anything other than a miniscule volume of texts through the email-to-SMS gateway, you would need to pay for their enterprise messaging service. If the public safety agency/agencies in question subscribe to the FirstNet service, they should be able to reach out to their principal consultant (account team) and get a good resolution. V/r Tim ________________________________ From: NANOG <nanog-bounces+tim=mid.net@nanog.org<mailto:nanog-bounces+tim=mid.net@nanog.org>> on behalf of Dan Walters via NANOG <nanog@nanog.org<mailto:nanog@nanog.org>> Sent: Thursday, January 19, 2023 10:09 PM To: nanog@nanog.org<mailto:nanog@nanog.org> Subject: txt.att.net<http://txt.att.net> outage? Know this is a longshot, any chance anyone from the txt.att.net<http://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. Thanks, in advance. Daniel Walters Sr. Systems Admin Phone: 866.421.2374 ext.6213 Daniel.Walters@omnigo.com<mailto:Daniel.Walters@omnigo.com> [cid:image001.png@01D92C52.BEDD12C0] [cid:image002.png@01D92C52.BEDD12C0][cid:image003.png@01D92C52.BEDD12C0] [cid:image004.png@01D92C52.BEDD12C0]