Configuration for asterisk to ring all extensions

It seems like there ought to be a way to do this, either straight-forward or round-about, I need to configure the PBX I’m working on to ring all extensions, or a group of extension based on a pattern ‘00[0-9]’ or something, or just to plain ring all extensions at least. Even if a new extension is added, but without modifying the dial plan each time.

Please let me know if anyone knows any tricks

Ring group is your only option.

One crazy idea would be a Queue and you could log the new extension into the Queue with a ring all strategy.