Does AT&T still support SBCGlobal?

https://support.inkling.com/hc/en-us/community/posts/32686461982989--1-877-660-6474-Does-AT-T-still-support-SBCGlobalhttps://support.inkling.com/hc/en-us/community/posts/32686461982989--1-877-660-6474-Does-AT-T-still-support-SBCGlobalhttps://support.inkling.com/hc/en-us/community/posts/32686461982989--1-877-660-6474-Does-AT-T-still-support-SBCGlobal