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## Overview of Restricting Simultaneous Activation of Services

A mutex group defines a set of services that are mutually exclusive—services that the SAE cannot simultaneously activate for a particular subscriber. You can assign a service to more than one mutex group. When a subscriber requests activation of a particular service, the SAE determines which mutex groups contain that service. If the subscriber has current activations of other services listed in those mutex groups, the SAE proceeds in one of the following ways, depending on how you configured the mutex groups:

- Deactivates the other services listed in the mutex groups, and then activates the requested service.
- Refuses access to the requested service.

If the requested service is not listed in a mutex group, the SAE can activate the service regardless of any other services that the subscriber is using.

#### Related Topics

- Overview of Restricting and Customizing Services for Subscribers
- Overview of SRC Aggregate Services
- Restricting Service Activation
- Restricting Simultaneous Activation of Persistent or Automatic Services
- Adding a Mutex Group (SRC CLI)

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