BLV: Busy Line Verification

What does BLV mean? The above is one of BLV meanings. It may have other definitions. Please refer to the end of this passage.

Definition in English: Busy-Line Verification

BLV: Busy-Line Verification

What does BLV mean? The above is one of BLV meanings. It may have other definitions. Please refer to the end of this passage.

Definition in English: Busy-Line Verification