30 seconds to replace DQ'd player

[APHP]

I A1 fouls out. After coach is notified he takes 25-seconds talking to the sub he is sending in. The sub reports to the table before the 30-seconds is up. The throw-in following this foul is at the division line opposite the table. Question::will you blow your whistle to resume play. If so, then you are saying it is a resumng play procedure (i.e. following a timeout, intermission or unusual delay)..if you don't blow your whistle, then you are saying it is not a resuming play procedure....and just put ball on floor and go. I repeat the question--will you blow your whistle before beginning play???