What does ISDN stand for?
ISDN stands for "International Subscriber Directory Number"
How to abbreviate "International Subscriber Directory Number"?
"International Subscriber Directory Number" can be abbreviated as ISDN
What is the meaning of ISDN abbreviation?
The meaning of ISDN abbreviation is "International Subscriber Directory Number"
What does ISDN mean?
ISDN as abbreviation means "International Subscriber Directory Number"
