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# Restricting Simultaneous Activation of Persistent or Automatic Services

The SAE uses the following method to prevent simultaneous activation of mutually exclusive services that are configured for persistent activation or that are activated automatically when a subscriber logs in:

1. If you (or a subscriber) persistently activate an existing service or change a subscription to activate an existing service when a subscriber logs in, the SAE determines whether the service is specified in one or more mutex groups.
2. The SAE determines how each mutex group that lists the service is configured, and the SRC software acts accordingly.
   - If all the mutex groups that list the service allow automatic deactivation of services, the SRC software removes the persistent activations for the service and changes activate-on-login subscriptions to manual.
   - If any of the mutex groups does not allow automatic deactivation of services, the SRC software will not allow you to:
     - Persistently activate the service.
     - Change the subscription to activate the service when a subscriber logs in.

#### Related Topics

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

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