I am not sure and can't find in the manual, is there any special code for block keypad (like on cellphones)? Station can receive calls, but I can't answer (because of not working answer key). Is there possibility, that keys are damaged?
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I am not aware that we can "lock" the keyboard and can only assume the unit is defective.
Has this ever worked or is this a new unit?
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Do you have the EX mics plugged into the phone. If so can you test the issue without them plugged in? Also make sure they are VTX 1000 mics and not SS2W mics. This can cause the keypad not to work on the phone.