It took several long calls with support and a disruptive visit from an AT&T tech to convince support that the problem was with Sonic, and not my inside wiring. Every time the ticket progressed through the system, it again regressed to being a presumed problem with "IW" (Inside WIring) even though I ruled that out with an MPOE test after the first call. And I was told that Sonic has no means of providing regular updates, other than for me to call back.
We are frequently told here that a voice line is a vital, integral, and inseparable part of Sonic service. Mine was out for 5+ days. How much of a service credit can I and the other affected customers expect on the next invoice?