Libero Replacement During Timeout

[blueump]

Ran into our first snag of the year with the Libero serving. For Team A - #20 was on the court when Team B called a time-out. At the end of the timeout #20 was now on the bench with #24 now playing in the front row and the Libero serving. The two regular players should have made an exchange in the Libero zone, but the time-out prevented this from happening. I followed without a problem, however, there was no player exchange in the Libero zone before or after the time-out...the new player just came on and took her position after the time-out.

What should be the correct process for this exchange? Should they make the exchange before leaving the court for a time-out? Should they make the exchange after the time-out? Or should they simply inform the umpire that they will be changing during the time-out? What's the correct procedure here?

How have you college guys handled this?