I have an IP40 switch, and have assigned about 10 extensions with numbers like 133, 144, 155, etc.

I have noticed that I can use the extension programming feature (31) to program extensions with numbers lower than 128... but not extensions higher than that. I can call these other extensions without a problem, just not change their name, mailbox, etc.

Before I renumber, any ideas?

I'm guessing it has to do with the number of extensions allowed in that unit, but I've never worked on an IP40. Wait and see if anyone else chimes in. If not, I can look it up for you.

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