[Back In The Saddle]

Ideally (some scorekeepers seem to require 3-5 business days to notify you of a player's fifth foul) your first order of business after reporting the foul is the notify the player's coach, then notify the player, then instruct the timer to begin the 20 second timer. You do not shoot free throws until the player is replaced. You do not grant any time out requests until the player is replaced. Any other subs that are waiting to come in when the replacement enters, may enter as well.

Non-ideally, all the above is still true, but you do it as soon as the scorekeeper finally notifies you of the player's 5th foul. There is no penalty for the player continuing to play if the scorekeeper has failed to notify the officials that the player is disqualified.