Deal with legacy, the ugly way
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Using Asterisk for a very long time, we are using an interface not present in current version in the way we need it. We ignored it for too long and now we got stuck with it until we finished the new setup. There are several problems using that old software. On modern Linux the old libs needed to run Asterisk 11 are not supported anymore and new hardware do not support old Linux. But there is a way out of it. We figured out a way using docker. But with all that legacy this turns out quite ugly. This is a good "bad" example how not to ignore your systems.
Now we know better but it has been a hard way.