Block/Blacklist Calls on Grandstream Phones - unsupported

Please see attached PDF for instructions to blacklist inbound calls by number on certain Grandstream phones.


The best bet is to search for "Grandstream blacklist" and your phone model number.


Note:  A blacklisted call will not be disconnected.  The phone will respond with "Busy Here" as if you were on Do Not Disturb and the call will roll over to your failover option.



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