Subsitution problems

[tomegun]

I have been having a real problem with substitutions in my new area. A lot of officials here do not insist on a horn from the table for a substitution. Instead, they blow the whistle for subs which is not a high school mechanic. They also allow subs to come to the table one at a time when the ball is ready to be put into play. In fact, some guys use the whistle entirely instead of their voice for things like telling the players to give them the ball. For instance, one partner calls travel and goes to become new lead. The official who is going to put the ball into play blows the whistle to tell the player to give him the ball instead of using his voice and telling the player where the spot is.
I created some problems last night because I insisted on the players being at the table and a horn from the table.

Do you guys use the whistle for every sub along with or instead of a horn from the table?