What does NDB stand for?
NDB stands for "Network-Determined Busy"
How to abbreviate "Network-Determined Busy"?
"Network-Determined Busy" can be abbreviated as NDB
What is the meaning of NDB abbreviation?
The meaning of NDB abbreviation is "Network-Determined Busy"
What does NDB mean?
NDB as abbreviation means "Network-Determined Busy"
