Polycom IP 450 User Manual page 26

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How to clear user settings?
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Reset user configuration: language, ringtone, directory
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Press Menu > Settings > Advanced
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Enter the admin password: 456 by default
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Press Admin Settings > Reset to Defaults > Local Configuration
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After some time the phone will reboot and get the default user configuration
from the SOP
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How to clear device settings?
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Reset network configuration
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Press Menu > Settings > Advanced
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Enter the admin password: 456 by default
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Press Admin Settings > Reset to Defaults > Reset Dev. Settings
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After some time the phone will reboot and get his network configuration from the
SOP
Phone reset