Grandstream Networks GXP21 Series User Manual page 70

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Users can press SpkOn softkey to activate the speaker sound or press SpkOff softkey to disactivate it.
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Figure 39: Group listening
Do Not Disturb
Do Not Disturb can be enabled/disabled from phone's LCD by following the steps below:
Press the Menu button and select "Preference" using navigation keys;
Press Menu button again to get into Preference options;
When "Do Not Disturb" is highlighted, press Left/Right key to disable/enable DND;
Press "Save" softkey to save the change
Users could also enabled/disable DND quickly by pressing the Mute button, note also that mute button
function can be set also to idle Mute, or be disabled under the web GUI option Settings ? Call
features ? Mute Key Function While Idle.
If the contact number belongs to Blacklist group, the call from this number will be blocked. If the
contact number belongs to Whitelist group, when the phone is on DND mode, the call from whitelist
number will be allowed.
This can be done from the web GUI or under "Phonebook > Contacts" by adding a user into either the
"Blacklist" or "whitelist" as shown below.
Page 70
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