By default NEC IPK has a Maintanance set up to 4 hours. That means if was no call made into or out of the system during 4 hours the IPK goes into reset and all phones will show "Initalizing". there are two ways to solve that problem: Reset or wait. Sometimes just one or two ports would do the same thing. Usually it is on the same ESI card. Pull the card and push it back in with power up. I noticed that most of the time it is heppaned on ESI(E), expension 8 port cause of bad crimp for the jack or cause the jack itself.