I've been watching this, and I take away three ideas. I've personally experienced the challenges with calls, too. I know it's a real problem.

1. A unique chime sound indicating a call vs. other radio chatter.

2. Consider putting calls on a unique channel not used for corner workers and other operational communications.

3. Work from a call list with all the calls printed out. Cross them off as they are called so we don't lose place.

Did I get it?