びい-ISDN あいえすでぃうえぬじゃなかったです
bii-a ie sudiuenujanakattadesu

Noun
Desu Copula

The polite, past negative form of B-ISDN

1. Wasn't BISDN.; It wasn't BISDN.

Past/Perfective
Negative
Polite
Casual Register
Telecommunications