Talk on a Radio
First, decide who your dispatcher or secretary is. The dispatcher is the person who sends out the calls to a person for what ever event. Label or Nick-Name this person BASE. This Will come in handy later.
Give all the users a radio and a Nick-Name. By Nick-Name, do not label people Momma-bear or Papa-Bear. Remember, you are trying to sound Professional.
When you want to call BASE, you simply say "[your nick-name] to BASE.
When your nick-name is being called, you say : "Go Ahead".
The Calling person says or asks what they want to say/ask.
After the conversation is done, the person who called the other person has the option to say and ONLY SAY: "Clear" The other person can repeat this ONLY once.
To call someone other than BASE, just say something like this: [Packaging Dept to Josh] - Josh will then say ["Go Ahead'].