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Polycom SoundPoint IP 331 nasty fuckup

There's a huge weird bug in Polycom SoundPoint IP 331 PoE phones.

When changing display name using web panel you can enter space in it. This will be accepted, but after phone is restarted this will render in useless (many features not working; unable to call any number).

You'll be forced to reset your phone to defaults (see here for details).

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