I could see a potential reason why this might’ve been sent. NSV0705A read as;
November, Sierra Victor, Zero, Seven, Zero, Five, Alpha,
takes up a considerable time on the frequency.
As a friendly reminder its helpful to limit callsigns lengths when on the expert server. You are limited to 8 letters/numbers when creating your own callsign under the “General Aviation” tab. This tab is also where you will set your VA callsign (if any). For guidance, below are what I would consider a safe option for you and others when flying:
For Airlines to 4 digits, (ie: Speedbird 1234 or Air France 5678) Most airlines do not exceed 4 numbers for their flight number.
For General Aviation a good rule to try to follow limit yourself to a 6 alpha-numeric combination (ie: N1234Z or C-TAGS)
For Virtual Airlines, its ok to have your 3 or 4 letter VA code, and then your 3 or 4 numbers following. (ie: AAVA1234 or NSV123)