Fascinating! They took advantage of the fact that the AXE allows new software to be installed without rebooting the system, an important feature when any inter

Fascinating! They took advantage of the fact that the AXE allows new software to be installed without rebooting the system, an important feature when any interruption would disconnect phone calls, lose text messages, and render emergency services unreachable. To let an AXE exchange run continuously for decades, as many of them do, Ericsson's software uses several techniques for handling failures and upgrading an exchange's software without suspending its operation. These techniques allow the direct patching of code loaded in the central processor, in effect altering the operating system on the fly. Do they run erlang?