In my (somewhat limited) experience, I think I've figured out that this is a phone problem and not a Sipura prob. I have a Panasonic cordless with a MWI light that will also stay on, even after the stutter tone is canceled in the Sipura and the phones are not being flashed the caller ID "Msg Waiting". My experience might be different from yours because even after unplugging the Sipura the problem remained on the Panasonic. It was only corrected when the phone rang a second time, which I guess makes the Panasonic go back and check if there is any new message waiting.
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