Sagem MY850Carat User Manual page 19

Blacklist
The blacklist is used to limit failures on automatic calls (calls generated by the automatic redial function or by applications:
data, fax for example).
When several automatic calls failed with a number (number busy or unknown), this number is put in the blacklist and no
automatic call will be done with this number any more until you delete it from the blacklist.
- Note: this function does not apply to the calls performed manually.
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Calls