The system can be programmed to send to certain tower sites certain talkgroups even with no user affiliated on that TG. This allows users who are on another TG but scanning to be able to hear traffic on that particular TG. Large utilities, like Entergy use this on their multiZoned network.
The system can be configured to send messages to specific tower sites without a user present, allowing users on different talkgroups to listen in on the designated talkgroup. This is common practice for large utilities such as Entergy, who use it on their multi-zoned network.