This is related to the Push to Talk function:
PTT Settings
1. In Idle mode, press Menu -> PTT and press the Select soft
key or the key.
2. Select PTT Settings and press the Select soft key or the
key. Choose from the following options:
• My Availability: this option allows you to change your Availability
status. Use the Up or Down Navigation key, to highlight Do Not
Disturb or Available and press the Select soft key or the key.
You can find the manual here:
http://images.comparecellular.com/phones/1362/samsung-rugby-ii-user-guide.pdf
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