I have a 7821 phone. There is no indication on the screen and no continual beep. It does beep once when putting it in mute and twice when taking it off, but it is very hard for me to see whether the mute button is lighted. I don't know why they would have used the particular hue of red that they did. Cisco is a big company and should be able to do colorblind testing before putting these things out. After all, roughly 10% of the male population are colorblind, you'd think that might occasion a little more concern for the subject. To make the claim that the difference in the beeps makes these phones accessible to colorblind people is ludicrous.
The least they could do is have a mute icon come up on the screen. They could also provide a kit for changing the color. How about getting a color blind person to check it out before you put it on the market?
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