System Mitel 5000.
I had a phone that had this message on it this morning:
HTML application terminated insufficient memory
Can anyone tell me what that means?

What ver of 5000 and what type of IP fone?

3.2.4.54.
5330 IP phones.

This is a known problem linked mainly to the screen saver on the fone itself. Disabling the screen saver and rebooting the fone should fix the issue.