Self Admin of new employee set up should automatically set up a telephony ID for the employee and an outbound line should be set up for the employee when an employee is added for use in C2C. The outbound should be registered for the account with shake/stir (spam prevention).
If an employee is removed/deactivated then the outbound number is not disabled or removed but is rerouted to the main default number. The account admin can also choose to reassign the outbound number.
An addition to this idea provided to us from Morgan group is to have a default target number saved in the account settings so when an employee is disabled the outbound C2C line would ring to the default number so they can easily remove employees without having extra steps to change the outbound ring to. CarWars currently does this and Morgan finds it useful.