What does USDN stand for?
USDN stands for "United States ISDN"
How to abbreviate "United States ISDN"?
"United States ISDN" can be abbreviated as USDN
What is the meaning of USDN abbreviation?
The meaning of USDN abbreviation is "United States ISDN"
What does USDN mean?
USDN as abbreviation means "United States ISDN"
