Unable to receive calls or texts from AT&T network customers

I can see AT&T blocking a number from CALLING their network,   but is it possible for them to BLOCK a number being called?   Example - As a AT&T cell phone user, making a call from the AT&T phone to a number like 911  - AT&T can block that?

Friday I was on a call with AT&T as they were researching what they are able to block.  Aldous was kindly checking with his manager, and everything he had access to search.  Per AL  AT&T does not have the ability to block a phone number for their entire network.   Can block for individual lines, but not for the network.     45 minutes into the call,  I received the call back I requested for the T-Mobile Technical Expert - so I was on a AT&T phone (mom’s) with the AT&T rep,   and on My T-Mobile phone with the T-Mobile rep.     AT&T saying they can block a phone for the whole network,  and T-Mobile saying we don’t see them trying to connect to the T-Mobile network.

And at the same time - my Brother on his AT&T phone trying to call my Wife’s T-Mobile phone, getting the message:  “Not accepting calls at this time”,  30 seconds after my son one his T-Mobile phone talking to his mom on the T-Mobile not accepting calls from AT&T.

Very odd  -  though I did hear there have been issues with one network calling another network.

Currently have a case open with AT&T  and a case open with T-Mobile.

Opened another AT&T case from an AT$T phone for not being able to call the T-Mobile number 713-###-####.   The agent reset some items, that required rebooting the AT&T phone twice,  after the 2nd restart - was able to call the t-mobile 713-###-#### number.    The error message was  Message 24  US01LV - which is an AT&T error message.   

Looks like I need to get 16-20+  known AT&T customers to call support and reset something to allow calling that number.

Hi everybody,

I’m having this same issue, not receiving calls from ATT landline, was working fine and then no more. have been with T-mobile tech support for 2 days and ATT tech support trying to fix this issue. ATT tech support still working on the problem with no answer yet. They have case file open and also T-Mobile has a case file open on this problem. Try different ATT landline customers and same issue they can not complete the call with our 2  T-Mobile numbers. phone just rings forever with no messages.😥😤

Will update as soon this is corrected.